underarm

American  

[uhn-der-ahrm] / ˈʌn dərˌɑrm /

adjective

1. of, situated, or for use under the arm or in the armpit.

   an underarm deodorant.

2. underhand.

   an underarm pitch in softball.

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noun

1. armpit.

adverb

1. underhand.

underarm British  

/ ˈʌndərˌɑːm /

adjective

1. (of a measurement) extending along the arm from wrist to armpit

2. sport of or denoting a style of throwing, bowling, or serving in which the hand is swung below shoulder level

3. below the arm

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adverb

1. in an underarm style

Etymology

Origin of underarm

First recorded in 1810–20; under- + arm ¹

Example Sentences

But Moutet reeled off four straight games from 0-3 down, throwing in some underarm serves, dropshots and tweeners for good measure.

From Barron's • Jan. 23, 2026

The bowler must ask the striker if he or she is ready and then yell "play" as the jingling ball is delivered underarm with at least one bounce.

From Barron's • Nov. 22, 2025

The ball jingles and is bowled underarm along the pitch.

From BBC • Nov. 21, 2025

Another described her underarm skin as developing a pink rash which had "scabbed over".

From BBC • Sep. 9, 2025

Joinville grabbed his elbow and his underarm and helped him up.

From "The Inquisitor's Tale" by Adam Gidwitz