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."
by Single Mingling Pringle May 11, 2014
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kicking a dead horse • Kicking a ball and pretending to be hurt • Kicking a can down Union Street • kicking a cow to move it • kicking a drab • Kicking a pasty down the High St. • kicking a wall • kicking mineta out of 1-a • A one legged man in an arse kicking contest. • like a one legged man at an ass kicking contest