arm‧pit /ˈɑːmˌpɪt $ ˈɑːrm-/
noun [countable]1. the hollow place under your arm where it joins your body
2. the armpit of something American English informal the ugliest or worst place in a particular city or area:
Dale says Butte is the armpit of Montana. [TahlilGaran] Dictionary of Contemporary English ▲