21.not have a leg to stand on没有好的证据支持某人的言行

Tom maintains that the firm owes him some back wages for having worked overtime. However, he won't have a leg to stand on unless he can prove that he put in all those extra hours. He doesn't stand a chance of getting his money without a strong foundation of facts to support his position.

汤姆坚持说公司拖欠他的加班工资。可他却没法证明，除非他能证明他确实加班了。如果没有有力的证据支持他的说法，他根本没有机会拿到钱。