beat a dead horse
中文释义
无谓地重复，徒劳无功。
Continuing to discuss something that has already been settled.
常用搭配
- flog a dead horse白费口舌
- keep at a lost cause做无用功
- labor in vain徒劳无功
例句
- The topic's closed, stop beating a dead horse.话题结束了，别再纠缠。
- Reopening that debate beats a dead horse.重提那场争论纯属徒劳。