slipjoint

Noun

 * 1)  A type of  for a, 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  mechanism; it is thus a  type of joint.
 * 2)  A knife or other tool with such a joint; usually a pocketknife.

Translations

 * Danish:
 * Finnish: kitkalukko
 * German: Slipjointverschluss
 * Russian:
 * Swedish: