Noun
(chiefly attributive) A type of joint for a folding knife, involving a spring that helps hold the blade open against some pressure but does not lock it open in the sense of any positive engagement by the parts of any lock mechanism; it is thus a nonlocking type of joint.
(metonymically) A knife or other tool with such a joint; usually a pocketknife.
Hypernyms: folding knife, folder, clasp-knife
Coordinate terms: button lock, frame lock, liner lock, lockback