Etymology

armpit

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Today it means: The cavity beneath the junction of the arm and shoulder. Full definition →

Middle English armpitt
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The story

  1. Middle English · inherited fromarmpitt
  2. English todayarmpit

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

Etymology from Wiktionary, CC BY-SA 4.0.