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to flog a dead horse
01
to waste one's time and effort in hopes of doing something that is seemingly impossible
![to [flog] a dead horse definition and meaning](https://cdn.langeek.co/photo/40835/original/?type=jpeg "to [flog] a dead horse definition and meaning")
Example
Is it just flogging a dead horse to ask for another recount of the votes?
例
Is it just flogging a dead horse to ask for another recount of the votes?
