beat a dead horse
US /biːt ə dɛd hɔrs/
UK /biːt ə dɛd hɔrs/
1.
죽은 말 때리기, 헛수고하다
to waste effort on something that is no longer possible or cannot be changed
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Trying to convince him now is just beating a dead horse; he's made up his mind.
지금 그를 설득하려는 것은 죽은 말 때리기일 뿐이야; 그는 이미 마음을 정했어.
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Let's move on to a new topic; we're just beating a dead horse with this argument.
새로운 주제로 넘어가자; 이 논쟁은 그냥 죽은 말 때리기야.