by guess and by God
without specific guidance or direction
This expression was originally used in a nautical context where it meant to steer blind without the guidance of landmarks.
The alternative by guess and by Godfrey is also sometimes found.
RELATED IDIOMS :
anybody can guess
a totally unpredictable matter – informal
1999 - Jason Elliot - An Unexpected Light - The most likely scenario was a government alliance with the forces of the north, although it was anyone's guess how long such a Faustian pact might last.
by guess and by God :
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