be anybody's guess

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be anybody's/anyone'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.
See also: guess

be anybody's guess

or

be anyone's guess

If you say that something is anybody's guess or is anyone's guess, you mean that it is impossible to know what is true or what will happen. How she managed to stay there for an entire month was anybody's guess. How long the fuel would last was anyone's guess.
See also: guess
References in periodicals archive ?
But quite why Buck feels the need to trumpet Chelsea as one of the "10 or 12 big clubs in Europe" is anybody's guess.
How long will this feel-good factor continue is anybody's guess given that forced conversions have not been halted.
Will it be a selection committee which will decide or are trials going to be held is anybody's guess at the moment.
He's the only character still standing who appeared in that very first episode back in 1986, although how long for is anybody's guess - Charlie suffers a heart attack after diving into freezing water to save Zoe's life at her wedding reception.
What awaits in Israel on Tuesday is anybody's guess, with Evans and defensive partner Gareth McAuley both suspended alongside midfielder Oliver Norwood.
Summary: SHARJAH -- Many restaurants seek donations purportedly in the name of offering free iftars to the poor people, but whether these are actually used for the purpose or not is anybody's guess.
Whatsoever the reason, why these people have suddenly increased rents is anybody's guess.
"He has won four out of five but he has never raced on anything worse than good and he is only a pony, so how he will handle soft ground is anybody's guess," said Hannon.
But now, the Doctor and his friends must try to find a way out of the wreckage of a crashed space liner - how they're going to do that before the Weeping Angels close in on them is anybody's guess. However, they seem considerably lucky in comparison to poor old Amy.
The Doctor is summoned to war-torn London by an old friend, but gets a shock when, on entering the Cabinet War Rooms, he comes face to face with his oldest enemies - which have now been painted khaki and, for reasons unknown, are sporting utility belts (how they can use them is anybody's guess).
What the real figures actually were is anybody's guess. I know people who were laid off so many times they had their own place reserved in the dole queue.
There was plenty of opposition to Kevin Ryan's four-year-old on Betfair, where he was a 6-4 shot at the off, so how he went from 11-8 to 10-11 is anybody's guess.
She was a beacon for democracy and where her country goes now in the wake of her murder by a suicide bomber is anybody's guess.
Where they will strike next against American interests, pitting their box cutters against aircraft carriers, is anybody's guess. That's where globalization comes in, in Barnett's brilliantly analyzed take on war in the age of terror.
How long borrowers will be able to count on this condition remaining in place, however, is anybody's guess.