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be anybody's guess
be anybody's guess
To be uncertain or unknown. Why dogs and cats hate each other is anybody's guess. No one has been able to determine why my daughter has been having nightmares—apparently, it's anybody's guess.
be anybody's guess
if a piece of information is anybody's guess, no one knows it Why Becky left is anybody's guess. 'So what's going to happen now?' 'That's anybody's guess.'