- the small depression beneath the arm where it joins the shoulder
Technical name: axilla
- slang an extremely unpleasant place: the armpit of the Mediterranean
WordReference Random House Learner's Dictionary of American English © 2017
- Anatomythe hollow place under the arm at the shoulder.
- Anatomythe hollow under the arm at the shoulder;
- 1300–50; Middle English; see arm1, pit1