Question

in_the_loop_028 to argue or pursue a point or topic without the possibility of success Synonyms: run (something) into the ground

Accepted Answer

BEAT A DEAD HORSE They should give up trying to argue with the boss on that subject. They’re beating a dead horse.The boy kept asking for a motorcycle, but his mother told him he could not have one and she would not change her mind. She told him he was beating a dead horse. The expression is usually used to describe verbal communication.

Id	in_the_loop_028
Idiom	BEAT A DEAD HORSE
Definition	to argue or pursue a point or topic without the possibility of success
Examples	They should give up trying to argue with the boss on that subject. They’re beating a dead horse. The boy kept asking for a motorcycle, but his mother told him he could not have one and she would not change her mind. She told him he was beating a dead horse.
Cross-Refs	Synonyms: run (something) into the ground
Extra Info	The expression is usually used to describe verbal communication.

Dead Horse Argue Beating Told Loop Beat Pursue