flog a dead horse

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Related to Flogging a Dead Horse: like death warmed up, sticking her oar in

beat a dead horse

To continue to focus on something—especially an issue or topic—that is no longer of any use or relevance. We've all moved on from that problem, so there's no use beating a dead horse.
See also: beat, dead, horse

flog a dead horse

To continue to focus on something—especially an issue or topic—that is no longer of any use or relevance. We've all moved on from that problem, so there's no use flogging a dead horse.
See also: dead, flog, horse

flog a dead horse

 and beat a dead horse
Fig. to insist on talking about something that no one is interested in, or that has already been thoroughly discussed. The history teacher lectured us every day about the importance of studying history, until we begged him to stop flogging a dead horse. Jill: I think I'll write the company president another letter asking him to prohibit smoking. Jane: There's no use beating a dead horse, Jill; he's already decided to let people smoke.
See also: dead, flog, horse