beat a dead horse

To "beat a dead horse" is an idiom that means to waste energy on a situation that cannot be changed, or to continue arguing a point that has already been settled. The phrase originated in the mid-19th century, likely evolving from the British variation "flog a dead horse." It draws upon the literal imagery of a jockey or cart driver attempting to force movement from an animal that is no longer capable of responding, symbolizing the ultimate futility of the effort.

For most English speakers, the phrase is a fossilized idiom; the literal meaning is rarely visualized, and it is viewed simply as a standard, non-offensive way to describe redundant effort. However, as awareness regarding animal ethics has grown, the term has come under scrutiny. Organizations such as PETA argue that "speciesist" language normalizes violence against animals and suggest that removing such violent imagery promotes a more empathetic society. Critics of this view often argue that policing established idioms is performative and that the phrase does not actually encourage real-world animal abuse.

Example:
"The committee has already voted against the proposal, so bringing it up again is just beating a dead horse."

Example:
"I don't mean to beat a dead horse, but we really need to finalize the venue before we send out invitations."