Definition of knifes:
(n) :
A utensil or a tool designed for cutting, consisting of a flat piece of hard material, usually steel or other metal (the blade), usually sharpened on one edge, attached to a handle. The blade may be pointed for piercing.
(n) :
A weapon designed with the aforementioned specifications intended for slashing or stabbing but too short to be called a sword; a dagger.
(v) :
(transitive) To cut with a knife.
(v) :
(transitive) To use a knife to injure or kill by stabbing, slashing, or otherwise using the sharp edge of the knife as a weapon.
(n) :
Any blade-like part in a tool or a machine designed for cutting, such as that of a chipper.
(v) :
(intransitive) To cut through as if with a knife.