beat a dead horse
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beat a dead horse (third-person singular simple present beats a dead horse, present participle beating a dead horse, simple past beat a dead horse, past participle beaten a dead horse or (colloquial) beat a dead horse)
- (idiomatic) To persist or continue far beyond any purpose, interest or reason.
- After having shown us three hours of instructional and safety videos, the inspector was simply beating a dead horse by telling us to buckle up as we got into the van.
continue far beyond reason — see flog a dead horse