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armpit

noun

  1. area of human body beneath joint between arm and torso
L43977 on Wikidata ↗

Wiktionary

Pronunciation: /ˈɑɹmˌpɪt/

noun

Etymology: From Middle English armpitt, arme-pitt, armput, equivalent to arm + pit. (something unpleasant): Presumably a reference to underarm body odor.

  1. The cavity beneath the junction of the arm and shoulder.

    She stood a couple of feet away from me […] exposing an edge of brassière strap at her armpit―exposing the armpit itself, a muscular hollow shadowed with fine stubble and faintly streaked with talcum.

    Unilever brought its Rexona deodorant to China a decade ago, dreaming of a market with 2.6 billion armpits.

  2. Somewhere or something unpleasant or undesirable.

    the armpit of America