your guess is as good as mine

your guess is as good as mine

I do not know either; I have no idea. Typically said in response to a question. A: "Where's Hank?" B: "Your guess is as good as mine. He didn't say anything to me." When it comes to the election, your guess is as good as mine as far as who is going to win.
See also: good, guess, mine
Farlex Dictionary of Idioms.

Your guess is as good as mine.

Inf. I do not know. Jane: Are there any good movies playing tonight? Alan: Your guess is as good as mine. Jill: How long should we bake this pie? Jane: Your guess is as good as mine.
See also: good, guess, mine
McGraw-Hill Dictionary of American Idioms and Phrasal Verbs.

your guess is as good as mine

I don't know any more than you do, as in As for when he'll arrive, your guess is as good as mine. [1920s]
See also: good, guess, mine
The American Heritage® Dictionary of Idioms by Christine Ammer.

your guess is as good as mine

People say your guess is as good as mine to say that they know as little about something as the person who is asking them about it. `Where did it come from?' — `Your guess is as good as mine, my friend.'
See also: good, guess, mine
Collins COBUILD Idioms Dictionary, 3rd ed.

your guess is as good as mine

I know as little about the matter as you (used in answer to a question).
See also: good, guess, mine
Farlex Partner Idioms Dictionary

your ˌguess is as good as ˈmine

(informal) neither of us knows the answer: ‘If the government knows how to run the country, why aren’t things getting any better?’ ‘Your guess is as good as mine!’
See also: good, guess, mine
Farlex Partner Idioms Dictionary

Your guess is as good as mine

sent. I don’t know either. I don’t know. Your guess is as good as mine.
See also: good, guess, mine
McGraw-Hill's Dictionary of American Slang and Colloquial Expressions

your guess is as good as mine

I don’t know the answer any more than you do. This American term first appeared in print in 1939, in Irene Baird’s Waste Heritage, but it may have originated a decade or more earlier.
See also: good, guess, mine
The Dictionary of Clichés by Christine Ammer
See also:
  • my guess is as good as yours
  • any (one) worth (one's) salt
  • keel over
  • young man
  • walk it off
  • walk off
  • Jinx!
  • cause eyebrows to raise and cause some raised eyebrows