your guess is as good as mine

US /jʊər ɡɛs ɪz æz ɡʊd æz maɪn/
UK /jʊər ɡɛs ɪz æz ɡʊd æz maɪn/
"your guess is as good as mine" picture
1.

senin tahminin benimki kadar iyi, ben de bilmiyorum

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

:
Why did he leave so suddenly? Your guess is as good as mine.
Neden bu kadar aniden gitti? Senin tahminin benimki kadar iyi.
When will the new policy be implemented? Your guess is as good as mine.
Yeni politika ne zaman uygulanacak? Senin tahminin benimki kadar iyi.