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armpit

/ˈɑɹmˌpɪt/ noun

In Latin: āxilla, āla Wiktionary

noun Definition from Wiktionary (CC BY-SA). Pronunciation from Wiktionary, via Kaikki.org. More about armpit at Wordnik → Where our words come from →

  1. The cavity beneath the junction of the arm and shoulder.
  2. Somewhere or something unpleasant or undesirable.
    the armpit of America

Origin

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

From Wiktionary, via Kaikki.org (CC BY-SA)