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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]

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Fill in the blank: I can’t figure out _____ gave me this gift.

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The American Heritage® Idioms Dictionary Copyright © 2002, 2001, 1995 by Houghton Mifflin Harcourt Publishing Company. Published by Houghton Mifflin Harcourt Publishing Company.

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