beat a dead horse
idiom
chiefly US, informal
1
: to keep talking about a subject that has already been discussed or decided
I don't mean to beat a dead horse, but I still don't understand what happened.
2
: to waste time and effort trying to do something that is impossible
Is it just beating a dead horse to ask for another recount of the votes?
Love words? Need even more definitions?
Merriam-Webster unabridged
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