beat a dead horse
中文釋義
無謂地重複，徒勞無功。
Continuing to discuss something that has already been settled.
常用搭配
- flog a dead horse白費口舌
- keep at a lost cause做無用功
- labor in vain徒勞無功
例句
- The topic's closed, stop beating a dead horse.話題結束了，別再糾纏。
- Reopening that debate beats a dead horse.重提那場爭論純屬徒勞。