bolster

1 of 2

noun

bol·​ster ˈbōl-stər 

1

: a long pillow or cushion

2

: a structural part designed to eliminate friction or provide support or bearing (see bearing sense 5)

bolster

2 of 2

verb

bolstered; bolstering ˈbōl-st(ə-)riŋ 

transitive verb

1

: to support with or as if with a bolster : reinforce

lay bolstered up in bed

extra men will bolster already augmented dock details

—Stanley Levey

2

: to give a boost to

news that bolstered his spirits

bolsterer

ˈbōl-stər-ər 

noun

Synonyms

Verb

• sustain
• support
• carry
• uphold

Examples of bolster in a Sentence

Verb

She came with me to bolster my confidence.

a convincing argument that was bolstered by the speaker's reputation

She is thinking of ways to bolster her career.

Recent Examples on the Web

Noun

The tiered, three-passenger saddle has bolsters for lower-back support as well as cruise control. —Michael Verdon, Robb Report, 11 July 2025

Mamdani is unelectable: His economic policies would set New York City back and his stance on Israel bolsters hate. —New York Daily News Editorial Board, New York Daily News, 20 June 2025

Verb

Following the recommendations from the NWS helps bolster your safety during air quality alerts, minimizing your exposure to potentially harmful pollutants. —Southern California Weather Report, Oc Register, 12 July 2025

In Vance’s home state of Ohio, U.S. Secret Service members bolstered a tiny crowd of 8,239, surveying the 26,000-seat venue and surrounding areas for any threat to a man who ranks first in the country’s presidential line of succession. —Elias Burke, New York Times, 12 July 2025

Word History

Etymology

Noun and Verb

Middle English, from Old English; akin to Old English belg bag — more at belly

First Known Use

Noun

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

Verb

1508, in the meaning defined at sense 1

Rhymes for bolster

• holster
• pollster

Kids Definition

bolster

1 of 2 noun

bol·​ster ˈbōl-stər 

1

: a long pillow or cushion

2

: a structural part designed to eliminate friction or provide support

bolster

2 of 2 verb

bolstered; bolstering -st(ə-)riŋ 

: to support with or as if with a bolster

also : reinforce

came with me to bolster my spirits

bolsterer

-stər-ər 

noun

Legal Definition

bolster

transitive verb

bol·​ster

ˈbōl-stər

: to use evidence usually improperly to give weight to (evidence already introduced)