armpit 
the hollow under the arm where it is joined to the shoulder (Freq. 2) - they were up to their armpits in water • Syn: axilla, axillary cavity, axillary fossa • Derivationally related forms: axillary (for: axilla) • Hypernyms: cavity, bodily cavity, cavum • Part Holonyms: shoulder • Part Meronyms: axillary artery, arteria axillaris
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