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]
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As an example of good science-and-society policymaking, the history of fluoride may be more of a cautionary tale.
The speaker conjures up centuries of collective sagacity, aligning oneself with an eternal, inarguable good.Politicians Only Love Journalists When They're Dead|Luke O’Neil|January 8, 2015|DAILY BEAST
I think everybody would like to be handsome and good at karate.
There was a lot of prison fiction from movies and books to mine.
Petty, shade, and thirst are my favorite human “virtues” and the trifecta of any good series of “stories.”‘Empire’ Review: Hip-Hop Musical Chairs with an Insane Soap Opera Twist|Judnick Mayard|January 8, 2015|DAILY BEAST
We resolved to do our best to merit the good opinion which we thus supposed them to entertain of us.
And with some expressions of mutual good-will and interest, master and man separated.The Posthumous Papers of the Pickwick Club, v. 2(of 2)|Charles Dickens
She did not need a great cook-book; She knew how much and what it took To make things good and sweet and light.
Kind of a reception-room in there—guess I know a reception-room from a hole in the wall.
The Seven-score and four on the six middle Bells, the treble leading, and the tenor lying behind every change, makes good Musick.Tintinnalogia, or, the Art of Ringing|Richard Duckworth and Fabian Stedman