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3. by guess and by gosh

by guess and by gosh

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by guess and by gosh

 and by guess and by golly

Rur. by estimating; without careful planning. Jane: Did you have a plan for putting up that toolshed? Tom: Nope, we just sort of did it by guess and by gosh. Grandma always made dresses by guess and by golly, without using a pattern, and they always turned out just fine.

See also: and, gosh, guess