back

1 of 4

noun

plural backs
1
a(1)
: the rear part of the human body especially from the neck to the end of the spine
(2)
: the body considered as the wearer of clothes
They were left with nothing but the clothes on their backs.
(3)
: capacity for labor, effort, or endurance
Put your back into it!
(4)
: the back considered as the seat of one's awareness of duty or failings
get off my back
(5)
: the back considered as an area of vulnerability
the police officer's partner always watches his back
b
: the part of a lower animal (such as a quadruped) corresponding to the human back
riding on the back of an elephant
c
: spinal column
She had surgery on her back.
d
: spine sense 1c
The title is on the book's back.
2
a
: the side or surface opposite the front or face
I only saw him from the back.
: the rear part
the back of the head
the back of the mirror
also : the farther or reverse side
wrote the number on the back of an envelope
b
: something at or on the back for support
back of a chair
c
: a place away from the front
sat in back
3
: a position in some games (such as football or soccer) behind the front line of players
also : a player in this position
a defensive back
4
informal : a swimming race in which swimmers use the backstroke
She placed first in the 100-meter back.
backed adjective
backless adjective

back

2 of 4

adverb

1
a
: to, toward, or at the rear
asked the crowd to move back
b
: in or into the past : backward in time
looking back on her youth
an event back in the last century
Back then, no one had ever heard of chronic fatigue syndrome.
also : ago
several years back
met him in the street two days back
c
: to or at an angle off the vertical
leaned back on his chair
d(1)
: under restraint
He wanted to fight but his friends held him back.
holding back a laugh
(2)
: in or into a delayed condition
Bad weather set the launch date back several days.
The meeting was pushed back at the last minute.
Season 2's final episodes were held back for a few weeks … before finally airing.Nick Valdez
e
: in an inferior or secondary position
especially : behind a competitor in points or ranking
finished three strokes back
2
a
: to, toward, or in a place from which a person or thing came
She left home and never went back.
put the book back
b
: to or toward a former state
went back to private life
c
: in return or reply
forgot to write back

back

3 of 4

adjective

1
a
: being at or in the back
back door
b
: distant from a central or main area
back roads
c
of a speech sound : articulated at or toward the back of the oral passage : formed deep within the mouth
back vowels
2
: having returned or been returned
3
: being in arrears : overdue
is owed several months in back pay
4
: moving or operating backward : reverse
back action with oars
5
: not current
back issues of a magazine
6
golf : constituting the final 9 holes of an 18-hole course

back

4 of 4

verb

backed; backing; backs

transitive verb

1
a
: to support by material or moral assistance
backing a candidate for governor
often used with up
back up a friend in a fight
b
: substantiate
often used with up
needs to back up her argument with evidence
c
: to assume financial responsibility for
back a new company
d
: to provide musical accompaniment for
often used with up
a singer backed up by a guitarist
2
a
: to cause to go back (see back entry 2 sense 1a) or in reverse
back the car into the garage
b
: to articulate (a speech sound) with the tongue farther back : to form deeper within the mouth
3
a
: to furnish with a rear part : to furnish with a back (see back entry 1 sense 2)
back a skirt with stiff material
b
: to be at the rear part of : to be at the back (see back entry 1 sense 2) of
a row of garages back the building

intransitive verb

1
: to move backward
backed into a parking space
often used with up
back up to give him some space
Let's back up a little to clarify what we're saying.
2
of the wind : to shift counterclockwise compare veer entry 1 sense 2
3
: to have the rear part facing in the direction of something
The house backs onto a golf course.
backer noun
Phrases
back of one's hand or back of the hand
: a show of contempt
back of one's mind
: the part of one's mind where thoughts and memories are stored to be drawn on
behind one's back
: without one's knowledge
talking about me behind my back
in back of
: behind
One day, I was sitting in the tiny parlor in back of the store …John McNulty
back and fill
1
nautical : to manage the sails of a ship so as to keep it clear of obstructions as it floats down with the current of a river or channel
2
: to take opposite positions alternately : shilly-shally
has been back and filling on the issue
back into
: to get into inadvertently
backed into the antiques business
Choose the Right Synonym for back

support, uphold, advocate, back, champion mean to favor actively one that meets opposition.

support is least explicit about the nature of the assistance given.

supports waterfront development

uphold implies extended support given to something attacked.

upheld the legitimacy of the military action

advocate stresses urging or pleading.

advocated prison reform

back suggests supporting by lending assistance to one failing or falling.

refusing to back the call for sanctions

champion suggests publicly defending one unjustly attacked or too weak to advocate his or her own cause.

championed the rights of children

recede, retreat, retract, back mean to move backward.

recede implies a gradual withdrawing from a forward or high fixed point in time or space.

the flood waters gradually receded

retreat implies withdrawal from a point or position reached.

retreating soldiers

retract implies drawing back from an extended position.

a cat retracting its claws

back is used with up, down, out, or off to refer to any retrograde motion.

backed off on the throttle

Examples of back in a Sentence

Noun She was carrying her little daughter on her back. She has a pain in the small of her back. I slapped him on his back to congratulate him. She stabbed him in the back. He had his hands behind his back. a bird with a dark back riding on the back of a horse a comfortable chair with a padded back Adverb The soldiers moved back from the front lines. The police asked the crowd to move back from the scene of the accident. He left his friends two miles back. She turned around and looked back toward him. a chapter beginning several pages back He left his home and never went back. It's time to go back home. She took the book off the shelf and forgot to put it back. In the opening chapter the author looks back on his youth. an event back in the last century Adjective He keeps his wallet in his back pocket. We came in through the back entrance. We drove on the back roads instead of the main roads. The company owes him several months in back pay. Verb I'm backing him for President. She backed the winner of the race and won a lot of money. She backed her argument with written evidence. She backed the singer on the guitar. She backed into a parking space. She backed out of the garage. The dog kept growling but backed off cautiously. back a skirt with stiff material
Recent Examples on the Web
These examples are automatically compiled from online sources to illustrate current usage. Opinions expressed in the examples do not represent those of Merriam-Webster or its editors. Send us feedback about these examples.
Noun
Smashing home Barca's third goal in the top corner past a hapless Andriy Lunin, Lamine mocked Vinicius Jr. by copying his celebration dance with Alejandro Balde, and also pointed to the name on his back in front of the home crowd like Madrid legend Cristiano Ronaldo once did at Camp Nou. Tom Sanderson, Forbes, 26 Oct. 2024 Bob came out of nowhere and hitchhiked to New York City with a guitar on his back. Seth Abramovitch, The Hollywood Reporter, 26 Oct. 2024
Adverb
With the United States on the verge of an election that could put Trump back in office, Billy wants people to know that what happened to him and several thousand other children reverberates still. Rebecca Santana, Los Angeles Times, 27 Oct. 2024 But back in 2022, Sen. Marco Rubio (R-FL) introduced the Domain Reform for Unlawful Drug Sellers Act— better known as the DRUGS Act. Elaine Mallon, Washington Examiner - Political News and Conservative Analysis About Congress, the President, and the Federal Government, 27 Oct. 2024
Adjective
The use of devices similar to tiki torches, candles, open flame kerosene lanterns are prohibited in the back country wilderness. Buffalo National River, arkansasonline.com, 29 Oct. 2024 The woman suffered multiple fractures to her hips and back area and was in stable condition Friday at a hospital, authorities said. Harry Harris, The Mercury News, 25 Oct. 2024
Verb
Harris’ YouTube channel released a trailer for Freedom Town on Monday backed by a song from rapper Megan Thee Stallion. Bloomberg, The Mercury News, 29 Oct. 2024 Japan will provide $3 billion in loans to Ukraine, backed by income from frozen Russian assets, Japanese financial daily Nikkei reported. Katya Soldak, Forbes, 29 Oct. 2024 See all Example Sentences for back 

Word History

Etymology

Noun

Middle English, from Old English bæc; akin to Old High German bah back, Old Norse bak

Adverb

Middle English bac, aphetic form of abak aback

Adjective

Middle English, partly attributive use of bac, back back entry 1, partly derivative of back back entry 2

Verb

verbal derivative of back entry 1

First Known Use

Noun

before the 12th century, in the meaning defined at sense 1a(1)

Adverb

13th century, in the meaning defined at sense 1a

Adjective

15th century, in the meaning defined at sense 1a

Verb

1548, in the meaning defined at transitive sense 1a

Time Traveler
The first known use of back was before the 12th century

Dictionary Entries Near back

Cite this Entry

“Back.” Merriam-Webster.com Dictionary, Merriam-Webster, https://www.merriam-webster.com/dictionary/back. Accessed 7 Nov. 2024.

Kids Definition

back

1 of 4 noun
1
a
: the rear part of the human body especially from the neck to the end of the spine
b
: the corresponding part of a four-footed or lower animal
2
: the part of something that is opposite or away from the front part
3
: something at or on the back for support
back of a chair
4
a
: a position in some games (as football or soccer) behind the front line of players
b
: a player in this position
backed adjective
backless adjective

back

2 of 4 adverb
1
a
: to, toward, or at the rear
b
: in or into the past : ago
c
: in or into a reclining position
d
: under control : in check
held back
2
: to, toward, or in a place from which a person or thing came
3
: in return or reply
write back
talk back

back

3 of 4 adjective
1
a
: being at or in the back
back door
b
: distant from a central or main area
back roads
2
: not yet paid : overdue
back rent
3
: no longer current
back issues of a magazine

back

4 of 4 verb
1
: to give aid or support to
2
: to move or cause to move back or backward
3
: to shift in a counterclockwise direction
the wind backed around
4
: to provide with a back
backer noun

Medical Definition

back

noun
1
a
: the rear part of the human body especially from the neck to the end of the spine
b
: the corresponding part of a lower animal (as a quadruped)
2
: the part of the upper surface of the tongue behind the front and lying opposite the soft palate when the tongue is at rest

Legal Definition

back

adjective
1
: being overdue or in arrears
back rent
2
: being retroactive especially as compensation
reinstated with back pay

Geographical Definition

Back

geographical name

river 605 miles (974 kilometers) long in Nunavut, Canada, rising along the border with the Northwest Territories and flowing east-northeast into the Arctic Ocean

More from Merriam-Webster on back

Last Updated: - Updated example sentences
Love words? Need even more definitions?

Subscribe to America's largest dictionary and get thousands more definitions and advanced search—ad free!