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What do a.m. and p.m. stand for?

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