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to flog a dead horse
01
to waste time and energy on something that cannot be changed or revived
Dialect
British
British![to [flog] a dead horse definition and meaning](https://cdn.langeek.co/photo/40835/original/?type=jpeg "to [flog] a dead horse definition and meaning")
Exemple
Arguing with him about his decision now is just flogging a dead horse—he's made up his mind.
