slipjoint

Etymology

From slip + joint.

slipjoint means 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. Lexicurio rates it Sui generis — a strength score of 89 out of 100.

noun

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.
A knife or other tool with such a joint; usually a pocketknife.