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your guess is as good as mine

your guess is as good as mine idiom
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]

The American Heritage® Dictionary of Idioms by Christine Ammer. Copyright © 2003, 1997 by The Christine Ammer 1992 Trust. Published by Houghton Mifflin Harcourt Publishing Company. All rights reserved.

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