underarm

[uhn-der-ahrm]

adjective

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

noun

armpit.

adverb

underhand.

Origin of underarm

First recorded in 1810–20; under- + arm¹

Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2018

Examples from the Web for underarm

Historical Examples of underarm

Sew up the sleeves and underarm seams and turn back the cuffs.
Handbook of Wool Knitting and Crochet
Anonymous
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
Work even to underarm 29 inches or desired length to underarm.
Juvenile Styles, Volume 4
Mary Hoyer

British Dictionary definitions for underarm

underarm

adjective

(of a measurement) extending along the arm from wrist to armpit
sport of or denoting a style of throwing, bowling, or serving in which the hand is swung below shoulder level
below the arm

adverb

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

Word Origin and History for underarm

adj.

1816, "underhand" (in reference to a style of throwing), from under + arm (n.1). First attested 1908 in dressmaking sense of "seams on the lower half of the arm-hole;" as a euphemism for armpit, it is attested from 1930s, popularized by advertisers.

underarm in Medicine

underarm

[ŭn′dər-ärm′]

adj.

Located, placed, or used under the arm.

The armpit.