any blade for cutting, as in a tool or machine. flick knife definition: a knife with a blade hidden inside its handle that springs out when a button is pressed. Learn more. 3 : … noun, plural knives [nahyvz] /naɪvz/. Learn more. A knife is a tool for cutting or a weapon and consists of a flat piece of metal with a sharp edge on the end of a handle....a knife and fork. Two robbers broke into her home, held a knife to her throat and stole her savings. . b : a weapon or tool resembling a knife. Definition of knife. knives definition: 1. plural of knife 2. plural of knife . Synonyms: blade, carver, cutter, cutting tool More Synonyms of knife knife - a weapon with a handle and blade with a sharp point bayonet - a knife that can be fixed to the end of a rifle and used as a weapon dagger, sticker - a short … a knifelike weapon; dagger or short sword. plural knives us / nɑɪvz / a tool or weapon used for cutting, usually consisting of a metal blade and a handle : a sharp knife We took plastic knives and forks on our picnic. knife translation in English - French Reverso dictionary, see also 'bread knife',carving knife',craft knife',fish knife', examples, definition, conjugation (Entry 1 of 2) 1 a : a cutting instrument consisting of a sharp blade fastened to a handle. 2 : a sharp cutting blade or tool in a machine. an instrument for cutting, consisting essentially of a thin, sharp-edged, metal blade fitted with a handle.