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2017 Word of the Year

God knows

1.
Also,goodness knows;heaven knows.
2.
Truly, certainly, definitely, as in God knows I need a winter coat. This expression, which originated about 1300 as God wot, does not necessarily imply that God is all-knowing but merely emphasizes the truth of the statement it accompanies. The variants using goodness and heaven are euphemisms that avoid taking God's name in vain. [ Second half of 1500s ]
3.
Also,God only knows. Only God knows, that is, neither I nor anyone else knows, as in God knows where I've stored those photos, or God only knows how many people will join the march. [ Second half of 1500s ]
The American Heritage® Idioms Dictionary
Copyright © 2002, 2001, 1995 by Houghton Mifflin Company. Published by Houghton Mifflin Company.
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Examples from the Web for god knows
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Historical Examples
  • god knows I ain't discountin' the comfort I've always took in him.

    The Spenders Harry Leon Wilson
  • I'm fond of Austin, god knows--but all my life he has been put in front of me.

    Viviette William J. Locke
  • My only hope of Ned, if he loves me—and god knows whether he does or no!

    The Bacillus of Beauty Harriet Stark
  • god knows what that young imp wouldn't swear if a fellow had no witnesses.

    Thoroughbreds W. A. Fraser
  • If you'd been a crook, well, god knows how we'd a-panned out.

    Thoroughbreds W. A. Fraser

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