alley cat
流浪猫，指一个行为不端的人
口语·形容行为不检点或自由散漫
英文释义
a person who leads a wild, carefree, and often promiscuous lifestyle
例句
He's a bit of an alley cat, always staying out late and partying.
典故来源
字面指流浪猫，20世纪初引申为形容生活放荡不羁、夜不归宿的人。