beat a dead horse

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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.
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beat a dead horse

to waste time doing something that has already been attempted Do you think it's worth sending my manuscript to other publishers or I am just beating a dead horse?
See also: beat, dead, horse

beat a dead horse

Also, flog a dead horse. Try to revive interest in a hopeless issue. For example, Politicians who favor the old single-tax idea are beating a dead horse. From the 1600s on the term dead horse was used figuratively to mean "something of no current value," specifically an advance in pay or other debt that had to be worked ("flogged") off. [Second half of 1800s]
See also: beat, dead, horse