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

waste one's breath

Speak in vain (because no one agrees), as in Don't waste your breath complaining to the supervisor—it won't help . This notion was first recorded about 1400 as wasting words . The exact idiom was first recorded in 1667. Also see save one's breath
The American Heritage® Idioms Dictionary
Copyright © 2002, 2001, 1995 by Houghton Mifflin Company. Published by Houghton Mifflin Company.
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