gravity knife

== English == === Etymology === From gravity +‎ knife. From being a folding knife that could be opened by allowing gravity to draw out the blade. === Noun === gravity knife (plural gravity knives) A type of knife that with the press of a button, allows the blade to drop out of the handle, and then quickly opened up full, for quick use, also allowing it to be flicked open with a flick of the wrist. A folding knife of this type. A telescoping knife of this type. ==== Hyponyms ==== paratrooper knife ==== Coordinate terms ==== (folding knife): button lock (a type that overlaps with gravity types) flick knife (open with a flick of the wrist) switchblade (spring-loaded opening knife) butterfly knife spring knife