[homoe]

"Beating A Dead Horse"

Beating a dead horse means someone keeps bringing up the same subject and wanting others to participate in a discussion or debate about it. While you feel every aspect of the situation, act, or circumstance has been gone over, someone continues bringing it up.

The phrase also refers to arguments that you feel are settled but another wants to keep bringing up.

Sidebar: The origin of the phrase may derive from horse racing where horses are slapped on the side with a riding crop to make them run faster. Beating a dead horse, of course, will not make it run at all, rendering the act pointless.