American English

Definition of armpit noun from the Oxford Advanced American Dictionary

 

armpit

 noun
noun
NAmE//ˈɑrmpɪt//
 
(informal pit)
 
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  • the part of the body under the arm where it joins the shoulder see also underarm
  • Idioms
    the armpit of something (informal)
     
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    the most unpleasant or ugly place in a country or region The city has been called the armpit of the South.
    See the Oxford Advanced Learner's Dictionary entry: armpit