to  be   anyone's  guess
be
ɛniwʌnz
enivanz
<abbr style="text-decoration: underline;" title="anyone's / anybody's" > anyone's</abbr>
gɛs
ges
<abbr style="text-decoration: underline;" title="guess / call" > guess</abbr>

Definition & Meaning of "be anyone's guess"in English

to be anyone's guess
01

to be difficult or almost impossible to predict the outcome of a situation or event 

to [be] (anyone's|anybody's) (guess|call) definition and meaning
Idiom
Informal

What is the origin of the idiom "be anyone's guess" and when to use it?

The idiom "be anyone's guess" likely originates from the idea that in situations where the outcome is uncertain or not easily predicted, anyone's guess is as good as another's. This idiom is used to express that something is unknown or unpredictable, and there is no definitive or clear answer.

Examples
Who will win the election is anyone's guess. 
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