flog a dead horse

更新日期：2026-08-14

词语	flog a dead horse
释义	flog a dead horse waste energy on a lost cause or unalterable situation 作无用功, 徒劳无益。 ˌflog a dead ˈhorse(BrE) (informal)to waste your effort by trying to do sth that is no longer possible鞭策死马；做徒劳无益的事
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