anybody's/anyone's guess(redirected from anybody's guess)
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Something that no one knows for sure, as in Will it rain next Sunday? That's anyone's guess. [Mid-1900s] Also see your guess is as good as mine.
anyone's guessa totally unpredictable matter. informal
1999 Jason Elliot An Unexpected Light The most likely scenario was a government alliance with the forces of the north, although it was anyone's guess how long such a Faustian pact might last.