What does "armpit" mean?

The cavity beneath the junction of the arm and shoulder.

What is a synonym for "armpit"?

Common synonyms include: ;, alveolus, armhole, armhole[dialect]]al>, arsehole, asshole.

//ˈɑɹmˌpɪt// noun, slang

noun, slang ·Moderate ·High school level

Noun

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."
2
the hollow under the arm where it is joined to the shoulder wordnet
3
Somewhere or something unpleasant or undesirable. colloquial, derogatory
"the armpit of America"

"She lives in the armpit of the world."

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

Data sourced from Wiktionary, WordNet, CMU, and other open linguistic databases. Updated March 2026.