When someone is being repetitious

When someone is being repetitious
So you said.
Stop beating a dead horse.
beating  a dead horse = continuing to argue a point that has been won
Stop harping on that subject.
harping on = dwelling on; talking about
You sound like a broken record. (idiomatic)
broken record = a grooved LP album with a scratch that makes the same track repeat endlessly
Must you belabor the point?
All right, already.
We get the point, already.
 We heard you, already.

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