armpit
noun [ C ] uk/ˈɑːm.pɪt/ us/ˈɑːrm.pɪt/
腋（窝）
the hollow place under your arm where your arm joins your body
sweaty/hairy armpits 汗湿的／长满腋毛的腋窝
Idiom
be the armpit of somethingidiom humorous 龌龊的地方；肮脏的角落；极差的地方
to be an extremely unpleasant, often dirty, place
the armpit of the North 北部地区一个极差的地方