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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.


noun

underarms plural
  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

"Collins English Dictionary — Complete & Unabridged" 2012 Digital Edition © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009, 2012

adverb

  1. in an underarm style

"Collins English Dictionary — Complete & Unabridged" 2012 Digital Edition © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009, 2012

Other Word Forms

Noun Inflected Forms

Etymology

Origin of underarm

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

Vocabulary lists containing underarm

Example Sentences

Examples are provided to illustrate real-world usage of words in context. Any opinions expressed do not reflect the views of Dictionary.com.

See Examples For:

Moutet has used the underarm tactic before, sending down six of them during his second-round win against Daniel Altmaier in Mallorca last year.

From Barron's Jan. 18, 2026

Bowling is underarm, unlike in the traditional game.

From Barron's Nov. 16, 2025

The tension has led to arguments over on-court etiquette - or the lack of it - with net cords, underarm serves and body shots all under scrutiny.

From BBC Sep. 3, 2025

The two-time major finalist was incensed by opponent Daniel Altmaier serving underarm during their second-round match, leading to a terse handshake and an animated discussion following the German's win.

From BBC Sep. 3, 2025

Have you noticed panic can lead to big-time underarm odor?

From "Feed" by M.T. Anderson

While the aluminum in antiperspirants can cause a type of allergic reaction called contact dermatitis for a small minority of people with sensitive skin, it’s usually perfectly safe for most underarms, she adds.

From National Geographic Sep. 6, 2023

She expressed distress about her voice deepening or growing hair on her underarms and face — concern about her body betraying her, of not being seen for who she is.

From Seattle Times Mar. 9, 2023

What area am I shaving: face, underarms, legs?

From Washington Post Jan. 3, 2023

"Remember, the harness needs to be quite tight under people's underarms," the navy diver told him.

From BBC Apr. 5, 2022

We explode clouds of aerosol, mixed for good luck with deodorants, into our noses, mouths, underarms, privileged crannies—even into the intimate insides of our telephones.

From "The Lives of a Cell" by Lewis Thomas

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