all is fair in love and war
爱情和战争中,一切皆公平
口语·用于辩解极端行为
英文释义
any type of behavior is acceptable or justified when dealing with love or war
例句
He stole her from his best friend, but all is fair in love and war.
典故来源
源自17世纪,源于战争和爱情中道德规则常被放宽的观念。