flog a dead horse
B2CEFR level
46/100Rarity: uncommon
InformalRegister
To waste effort on something that has no chance of succeeding or is already settled.
He keeps reopening the pay dispute, but honestly he's flogging a dead horse at this point.
Rarity runs from 0 (a word everyone knows) to 100 (almost never seen outside specialist or literary writing). Level is the word's real difficulty on the CEFR scale, from A1 to C2.
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