beats me
idiom
Meaning
An informal expression used to indicate that one does not know the answer to a question or the reason for something.
Examples
- I asked him why the train was delayed, but he just said, 'Beats me.'
- Beats me how they managed to finish such a complex project in only two days.
Synonyms: I don't know, no idea, haven't a clue, your guess is as good as mine