Definitions
1.NounA 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."He was looking for a knife to chop some steak."
2.NounA weapon designed with the aforementioned specifications intended for slashing or stabbing but too short to be called a sword; a dagger.
3.NounAny blade-like part in a tool or a machine designed for cutting, such as that of a chipper.
4.VerbTo cut with a knife.
5.VerbTo use a knife to injure or kill by stabbing, slashing, or otherwise using the sharp edge of the knife as a weapon."She was repeatedly knifed in the chest."
6.VerbTo cut through as if with a knife."The boat knifed through the water."
7.VerbTo betray, especially in the context of a political slate.
8.VerbTo positively ignore, especially in order to denigrate; compare cut.