your guess is as good as mine
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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]
QUIZ
WILL YOU SAIL OR STUMBLE ON THESE GRAMMAR QUESTIONS?
Smoothly step over to these common grammar mistakes that trip many people up. Good luck!
Question 1 of 7
Fill in the blank: I can’t figure out _____ gave me this gift.
Words nearby your guess is as good as mine
your, Yourcenar, you're, you're telling me, you're welcome, your guess is as good as mine, yourn, yours, yourself, yours truly, yous
The American Heritage® Idioms Dictionary
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