your guess is as good as mine
US /jʊər ɡɛs ɪz æz ɡʊd æz maɪn/
UK /jʊər ɡɛs ɪz æz ɡʊd æz maɪn/
1.
네 추측이 내 추측만큼이나 맞아, 나도 모르겠어
used to say that you do not know the answer to a question, or do not know what is happening, for the same reason as the person asking
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Why did he leave so suddenly? Your guess is as good as mine.
왜 그렇게 갑자기 떠났지? 네 추측이 내 추측만큼이나 맞아.
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When will the new policy be implemented? Your guess is as good as mine.
새로운 정책은 언제 시행될까? 네 추측이 내 추측만큼이나 맞아.