alley cat
流浪貓，指一個行為不端的人
口語·形容行為不檢點或自由散漫
英文釋義
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.
典故來源
字面指流浪貓，20世紀初引申為形容生活放蕩不羈、夜不歸宿的人。