By guess and by gosh American noun phrase
If somebody is doing something by guess and by gosh, he or she has a huge belief in his or her fortune and does the work without any careful examination or plans.
Make sure that we have all the plans updated. I don’t want things to be made by guess and by gosh.
A dedicated employee will never complete her task by guess and by gosh.
To be thankful or grateful for one's good luck usually while avoiding a bad situation
Used to indicate that it is very easy to guess something
A normally unreliable person can still be right about something, even if it is only by accident.
It is used to say that someone is lucky.
Used to describe someone who is naive, gullible, inexperienced, easily fooled, ignorant, unsophisticated, etc.
You don't even know this simple thing? Have you just fell off the turnip truck?