beating a dead horse, is an idiom that means a particular request or line of conversation is already foreclosed or otherwise resolved, and any attempt to continue it is futile; or that to continue in any endeavour (physical, mental, etc.) is a waste of time as the outcome is already decided.
beating a dead horse, is an idiom that means a particular request or line of conversation is already foreclosed or otherwise resolved, and any attempt to continue it is futile; or that to continue in any endeavour (physical, mental, etc.) is a waste of time as the outcome is already decided.