Waste effort on hopeless and unchangeable things, or continue discussing a matter that has already been concluded or resolved.
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To keep talking about or trying to fix something that is already finished or beyond help.
When you beat a dead horse, you waste time and energy on something that is already over and won't change.
It's used when someone refuses to let go of a topic or argument that has no chance of making a difference.
"Flogging a Dead Horse"
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Trying hopelessly to revive something already finished (British variant, same meaning)
"Going in Circles"
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Repeating the same discussion without making any real progress
"Beat a Dead Horse"
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Wasting time on something already over or beyond saving