There's no point in arguing about it anymore; you're just beating a dead horse
He keeps bringing up that old mistake, but he's just beating a dead horse
We've already agreed on the plan, so let's not beat a dead horse
Trying to convince her now is like beating a dead horse; she's made up her mind
The professor went over the same concept for an hour, essentially beating a dead horse
We need to move on to the next agenda item; we're beating a dead horse here
He's still complaining about the referee's call from last week. He's beating a dead horse
You can't change the past, so stop beating a dead horse and focus on the future
I've heard your side of the story a dozen times; I'm not going to beat a dead horse
They spent all night rehashing the debate, but it was just beating a dead horse
We need a new approach to this problem.
I agree, we are beating a dead horse.
Let's explore other options now.
You're beating a dead horse; it's over
There's no point in continuing this discussion
This argument is pointless and unproductive now