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Yours, Etc.: Origins and Uses of 8 Sign-Offs

take someone's name in vain

Speak casually or idly of someone, as in There he goes, taking my name in vain again. This idiom originated as a translation from the Latin of the Vulgate Bible (Exodus 20:7), “to take God's name in vain,” and for a time was used only to denote blasphemy and profanity. In the early 1700s it began to be used more loosely as well.
The American Heritage® Idioms Dictionary
Copyright © 2002, 2001, 1995 by Houghton Mifflin Company. Published by Houghton Mifflin Company.
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