We've been arguing about this for hours, but it's like flogging a dead horse; no one is going to change their mind
Trying to convince him to invest in that company is like flogging a dead horse; he's already lost a fortune there
She keeps bringing up that old mistake, but she's just flogging a dead horse at this point
The government's attempts to revive the outdated industry felt like flogging a dead horse
You can keep asking for a raise, but with the current economic climate, you're just flogging a dead horse
He's still trying to get his ex-girlfriend back; he's flogging a dead horse
Analyzing the data for errors after the project is complete is like flogging a dead horse
The politician continued to promise tax cuts, but his opponents said he was flogging a dead horse
I told him to stop, but he just kept going, flogging a dead horse with his complaints
There's no point in rehashing that argument; it's a classic case of flogging a dead horse
We keep talking about this old plan.
I know, it feels like we're flogging a dead horse.
Let's try a new approach then.
Trying to convince him is like flogging a dead horse
He's unresponsive to arguments, it's a waste of time
Persisting with this is futile; there's no progress