Definition
This idiom suggests that in the contexts of romantic pursuits and warfare, normal ethical standards may be disregarded.
在爱情和战争中，为了达到目的可以不择手段。
He resorted to cheating to win the competition, after all, all's fair in love and war.
他为了赢得比赛而作弊，毕竟在爱情和战争中，所有手段都是合理的。
When the competition got fierce, they seemed to forget about ethics, as they thought, all's fair in love and war.
当竞争变得激烈时，他们似乎忘记了道德，因为他们认为在爱情和战争中，所有手段都是合理的。
She used various tricks to pursue the person she liked, because, as the saying goes, all's fair in love and war.
她使用了各种技巧来追求她喜欢的人，因为俗话说，在爱情和战争中，所有手段都是合理的。