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underarm

[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
3.
adverb
4.
Origin
1810-1820
1810-20; under- + arm1
Dictionary.com Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2014.
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British Dictionary definitions for under-arm

underarm

/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
adverb
4.
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
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Word Origin and History for under-arm

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.

Online Etymology Dictionary, © 2010 Douglas Harper
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under-arm in Medicine

underarm un·der·arm (ŭn'dər-ärm')
adj.
Located, placed, or used under the arm. n.
The armpit.

The American Heritage® Stedman's Medical Dictionary
Copyright © 2002, 2001, 1995 by Houghton Mifflin Company. Published by Houghton Mifflin Company.
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