underarm

1 of 3

adjective

un·​der·​arm ˈən-dər-ˈärm 

1

British : underhand sense 3

2

: placed under or on the underside of the arm

underarm seams

underarm

2 of 3

adverb

un·​der·​arm ˌən-dər-ˈärm 

: underhand

underarm

3 of 3

noun

un·​der·​arm ˈən-dər-ˌärm 

1

: armpit sense 1

2

: the part of a garment that covers the underside of the arm

Examples of underarm in a Sentence

Adverb

He threw the ball underarm.

Recent Examples on the Web

Adjective

The aluminum and fragrance work to combat stinky sweat, while ceramides help keep your delicate underarm skin healthy. —Sara Coughlin, SELF, 23 July 2025

Nothing seemed out of the ordinary until Isaac appeared to kiss and sniff Chastain's underarm area. —Christina Dugan Ramirez , Larry Fink, FOXNews.com, 29 July 2025

Noun

Many people also notice hair loss or thinning along the outer third of the eyebrows and on their arms, legs, underarms and pubic area, says Kopelman. —Helen Carefoot, Flow Space, 6 Aug. 2025

Here are some hygiene tips: Shower daily and dry your underarms completely Exfoliate once or twice a week with a soft washcloth, glove, or gentle scrub to help unclog sweat glands and remove buildup. —Brandi Jones, Health, 24 July 2025

Word History

First Known Use

Adjective

1816, in the meaning defined at sense 1

Adverb

circa 1909, in the meaning defined above

Noun

1923, in the meaning defined at sense 1

Rhymes for underarm

• firearm
• alarm
• disarm
• forearm
• gendarme
• nonfarm
• rearm
• arm
• charm
• farm
• harm

Kids Definition

underarm

1 of 3 adjective

un·​der·​arm ˌən-də-ˌrärm 

1

: underhand entry 2 sense 2

an underarm toss

2

: placed under or on the underside of the arm

underarm seams

underarm

2 of 3 adverb

un·​der·​arm ˌən-də-ˈrärm 

: with an underarm motion

underarm

3 of 3 noun

un·​der·​arm ˈən-də-ˌrärm 

1

: armpit

2

: the part of a garment that covers the underside of the arm

Medical Definition

underarm

noun

un·​der·​arm ˈən-dər-ˌärm 

: armpit