Is there an equivalent expression for 'to beat a dead horse'in Mandarin Chinese?

Answer 1

In Mandarin Chinese, "To beat a dead horse" means "白费口舌(báifèikǒushé)" or "徒劳无功(túláowúɡōnɡ)." If you want to persuade others to change their decision, it is "白费口舌."

Answer 2

Yes, the equivalent expression in Mandarin Chinese for "to beat a dead horse" is "对牛弹琴" (duì niú tán qín), which means to play the harp to a cow.