sent. I don't know either. : I don't know. Your guess is as good as mine.
Dictionary of American Slang and Colloquial Expressions by Richard A. Spears.Fourth Edition. Copyright 2007. Published by McGraw Hill.
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Idioms & Phrases
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]
