be flogging a dead horse

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be flogging a dead horse

To be continuing to focus on something—especially an issue or topic—that is no longer of any use or relevance. I don't know why you're flogging a dead horse when the rest of us have moved on from that problem.
See also: dead, flog, horse

be flogging a dead horse

BRITISH or

be beating a dead horse

AMERICAN
If someone is flogging a dead horse, they are wasting their time trying to achieve something that cannot be done. After putting in all that hard work it feels like we're flogging a dead horse — it's all very discouraging. You're beating a dead horse on this. These guys are defeated.
See also: dead, flog, horse
References in periodicals archive ?
Agencies know they are flogging a dead horse to rid our estates of these scum as they have so many resources at their disposal having build them up for decades.
As the subject of yet another life story, the documentary makers are flogging a dead horse.
This is comforting, but the next step should be to stop all financial aid to Israel since it is quite obvious we are flogging a dead horse.
Clearly they are flogging a dead horse in some areas by wasting money like this.