be anyone's guess
US /bi ˈen.i.wʌnz ɡes/
UK /bi ˈen.i.wʌnz ɡes/
1.
誰也說不準, 難以預測
to be impossible for anyone to know or predict
:
•
When the new product will be released is anyone's guess.
新產品何時發布，誰也說不準。
•
What he'll do next is anyone's guess.
他下一步會做什麼，誰也說不準。