by guess and by God

by guess and by God

By any means, typically those that lack careful planning or rely on guesswork and luck. We don't have much to work with, but by guess or by God we're going to figure out a way to save our business! He just throws his essays together by guess or by God, but he still manages to get good grades on them.
See also: and, by, god, guess
Farlex Dictionary of Idioms. © 2015 Farlex, Inc, all rights reserved.

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.
See also: and, by, god, guess
Farlex Partner Idioms Dictionary © Farlex 2017
See also: