no-go adjective 3noun 2forms 4 adjective3 •Not to be entered.They lived in a no-go part of the ghetto.The noise and drunkenness made the area a no-go zone at night for families. •Not functioning properly. •That should not go (i.e., enter or engage) if the size of the part being measured is properly achieved.This bore is no good: the no-go pin is flying right into the first half of it. noun2 •(informal, slang) Something which should not or cannot be done. •(informal) A no-go gauge.There's your problem right there. See how that no-go slips right into the hole? The whole thing is scrap, unfortunately. formsno goes · no gos · no-goes · no-gos