your guess is as good as mine
US /jʊər ɡɛs ɪz æz ɡʊd æz maɪn/
UK /jʊər ɡɛs ɪz æz ɡʊd æz maɪn/
1.
あなたの推測は私の推測と同じくらい良いです, 私も分かりません
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.
なぜ彼はそんなに突然去ったのですか？ あなたの推測は私の推測と同じくらい良いです。
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When will the new policy be implemented? Your guess is as good as mine.
新しい政策はいつ実施されますか？ あなたの推測は私の推測と同じくらい良いです。