anybody's/anyone's guess
Definition of anybody's/anyone's guess
: something that is very uncertain or that no one knows What causes these changes is anybody's guess. It's anyone's guess what his next book will be about.
From the M-W Editors
Word by Word Definitions
guessplay
: to form an opinion of from little or no evidence
: believe, suppose
: to arrive at a correct conclusion about by conjecture, chance, or intuition
: conjecture, surmise
See the full definition of guess
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