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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
  • It's better to do that than for me to catch cold and be laid up for god knows how long.'

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

    Viviette William J. Locke
  • god knows I don't wish to differ with you, but circumstances seem always against us.

    Mr. Crewe's Career, Complete Winston Churchill
  • god knows what that young imp wouldn't swear if a fellow had no witnesses.

    Thoroughbreds W. A. Fraser
  • god knows what I was thinking, what I was wishing, what I was hoping!

    Katia Leo Tolstoy

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