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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:

Everyone was extremely friendly and on the fashion front, no popped collars in sight — only gym clothes and cool-looking fencing gear: mask, chest protector and underarm protector.

From Los Angeles Times Aug. 24, 2026

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

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

One advert for a deodorant called Mum, published in an American magazine in 1938, urged women to "face the truth about underarm perspiration odour".

From BBC Oct. 16, 2025

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

From "The Inquisitor's Tale" by Adam Gidwitz

Posting on TikTok, one customer claimed she wanted to "rip my armpits out", while another said her underarms felt like they were "on fire".

From BBC Sep. 9, 2025

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

Simone points out that most Leaf customers are women, because certain models are designed to shave large areas of skin, such as legs or underarms.

From Washington Post Jan. 3, 2023

He waited, tense, water bleeding out from his forehead and underarms.

From "The Great Santini" by Pat Conroy

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