kicking a dead horse

1.Attempting to reopen a topic or subject that is already resolved 2.To waste time doing something that has already been attempted

"If you're trying to get back with Ryan, you're just kicking a dead horse. He got back together with Becky."

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Kicking the dead horse

Pointing out a dry joke or horrible pun after it has already fallen flat.

Teacher : Yeah check it out
Student : Ok I will
Teacher : Get it? Check it out, for the chess tournament
Student : Your kicking the dead horse sir

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