I am reasonably certain that once, glancing over a long list of English idioms, I saw an idiom that I now remember as "walk on a branch" and cannot find anywhere, so my memory must be wrong.
The listed meaning was "to give it a long shot", "to make a not-necessarily-educated guess", the implication being that it is similar to stepping on a tree's branch that may crack under you foot.
I cannot look this idiom up anywhere, to the point where I am starting to doubt it even existed.
It was not:
Does it exist, and if so, what is it?