flick knife

Noun

 * 1)  A type of knife which has the blade mounted on a pivot so that it can fold back sideways into the handle when not in use, but can flick out straight, usually with a spring-loaded mechanism, when required.
 * 2) A type of folding knife, which with a flick of the wrist, using the momentum generated, can open the knife out straight.
 * 1) A type of folding knife, which with a flick of the wrist, using the momentum generated, can open the knife out straight.