knife Noun 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.
knife Noun A weapon designed with the aforementioned specifications intended for slashing and/or stabbing and too short to be called a sword. A dagger.
knife Noun Any blade-like part in a tool or a machine designed for cutting, such as the "knives" for a chipper.
knife Verb To cut with a "knife".
knife Verb To use a "knife" to injure or kill by stabbing, slashing, or otherwise using the sharp edge of the "knife" as a weapon.
knife Verb To cut through as if with a "knife".
knife Verb To betray, especially in the context of a political slate.
knife Verb To positively ignore, especially in order to denigrate. compare cut