knifeknife /naɪf/ noun (plural knives /naɪvz/) 
► knife
► knife a tool with a sharp blade which is used to cut things or used as a weapon: Could you pass me a knife to chop the onions with? Use a carving knife to cut the turkey.
► dagger a short knife used as a weapon in past times: A bronze dagger and a spear were found in the ancient grave of a warrior.
► sword a weapon with a long sharp blade, which was used for fighting in past times: Each knight drew his sword and prepared to fight.
► scalpel a small sharp knife that a doctor uses for doing an operation: The surgeon took the scalpel and made a cut in the patient's chest.
► jackknife a knife with a blade that folds into its handle: He took his jackknife out of his pocket and cut the apple into pieces.