best friend

noun

plural best friends

1

: a person's closest and dearest friend

She's my best friend.

We have been best friends since high school.

2

: a person's most desirable or valuable possession or resource

Diamonds may be a girl's best friend, but gold is more affordable.

—William Giese

Lycra-cotton leggings and tunic tops are the pregnant woman's best friend, sartorially speaking.

—Anne Reeks

When cops bang on the door, the toilet is a drug dealer's best friend.

—Frederick Kaufman

Examples of best friend in a Sentence

Recent Examples on the Web

Wilson plays Sam, a secret agent whose toughest mission to date is pleasing her bride-to-be best friend (Camp) at a lavish destination wedding. —Matt Donnelly, Variety, 6 Mar. 2025

In one scene before the party, Kardashian is driving with her best friend Malika Haqq, and the two discuss how neither of them is married. —Hannah Sacks, People.com, 6 Mar. 2025

Two hypotheses were looked at: One is that the DNA belongs to Madison Mogen, her best friend Goncalves and one unknown unrelated person. —Dalia Faheid, CNN, 5 Mar. 2025

Her best friend, Zikora, is a striver eager to have it all—a lucrative legal career and a husband and children. —Tyler Austin Harper, The Atlantic, 5 Mar. 2025

Word History

First Known Use

13th century, in the meaning defined at sense 1

Phrases Containing best friend

• man's best friend

Rhymes for best friend

• amend
• append
• ascend
• attend
• backend
• befriend
• boyfriend
• commend
• compend
• contend
• defend
• depend