[ uhn-der-ahrm ]

  1. of, situated, or for use under the arm or in the armpit: an underarm deodorant.

  2. underhand: an underarm pitch in softball.


Origin of underarm

First recorded in 1810–20; under- + arm1

Words Nearby underarm

Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2023

How to use underarm in a sentence

  • In fitting the outside the back is pinned on to the lining firmly, then the front and finally at the underarm seams.

    Textiles and Clothing | Kate Heintz Watson
  • An underarm dart gives a smooth adjustment over each hip, and in these darts are inserted the back edges of the vest.

  • Baste seams of sleeve and underarm all in one long seam on right side.

    Clothing and Health | Helen Kinne
  • Mark with tracing or pencil the new seam for underarm if you must change it.

    Clothing and Health | Helen Kinne
  • Baste, with the seams on the outside, shoulder, and underarm seams.

    Clothing and Health | Helen Kinne

British Dictionary definitions for underarm


/ (ˈʌndərˌɑːm) /

  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

  1. below the arm

  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