noun
armpit
AHRM-piht
noun
1
The hollow under the shoulder where the arm joins the body.
"He dabbed deodorant under each armpit before heading out."
"The shirt was soaked with sweat around the armpits."
2
Informally, a place or thing considered unpleasant, dirty, or undesirable.
"He joked that the motel was the armpit of the whole town."
How to Use Armpit
Learner’s notesIn plain EnglishThe area under your arm — or, informally, a way of calling a place grim and unpleasant.
When to use it
The "unpleasant place" sense is informal and often a bit rude about the place in question.
Common pairings
under the armpit
armpit hair
armpit of the country
Word Forms
armpits plural
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He dabbed deodorant under each _____ before heading out.
Etymology
A straightforward compound of "arm" and "pit", going back to Middle English.