go out on a limb

go out on a limb

To do or say something that lacks evidence or support. She really went out on a limb with that hypothesis—the facts don't support it at all. That politician went out on a limb and publicly questioned the views of his party. I don't think I'm going out on a limb by saying that everyone will like that idea.
See also: go, limb, on, out
Farlex Dictionary of Idioms.

go out on a limb

COMMON If you go out on a limb, you do something or say something that is different from what most people do or say and is therefore risky. He does not want to go out on a limb and try something completely new. There's nothing wrong with politicians going out on a limb sometimes and risking their reputation.
See also: go, limb, on, out
Collins COBUILD Idioms Dictionary, 3rd ed.
See also:
  • be out on a limb
  • (out) on a limb
  • limb
  • on a limb
  • out on a limb
  • mate
  • helpmate
  • all for one, and one for all
  • one for all, (and) all for one
  • not have a leg to stand on