Quote:
Originally Posted by Kätzchen
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I can't believe I forgot this idiom that someone in chat used to always use....
"Stop Beating A Dead Horse"
To continue to focus on something—especially an issue or topic—that is no longer of any use or relevance.
If an argument erupts and it's one that has been previously settled, then the idiom "beating a dead horse" might be said by someone who sees any further discussion on the topic to be meaningless.