- an instrument for cutting, consisting essentially of a thin, sharp-edged, metal blade fitted with a handle.
- a knifelike weapon; dagger or short sword.
- any blade for cutting, as in a tool or machine.
- to apply a knife to; cut, stab, etc., with a knife.
- to attempt to defeat or undermine in a secret or underhanded way.
- to move or cleave through something with or as if with a knife: The ship knifed through the heavy seas.
- under the knife, in surgery; undergoing a medical operation: The patient was under the knife for four hours.
Origin of knife
- a cutting instrument consisting of a sharp-edged often pointed blade of metal fitted into a handle or onto a machine
- a similar instrument used as a weapon
- have one's knife in someone to have a grudge against or victimize someone
- twist the knife to make a bad situation worse in a deliberately malicious way
- the knives are out for someone British people are determined to harm or put a stop to someonethe knives are out for Stevens
- under the knife undergoing a surgical operation
- to cut, stab, or kill with a knife
- to betray, injure, or depose in an underhand way
Word Origin and History for under the knife
late Old English cnif, probably from Old Norse knifr, from Proto-Germanic *knibaz (cf. Middle Low German knif, Middle Dutch cnijf, German kneif), of uncertain origin. To further confuse the etymology, there also are forms in -p-, e.g. Dutch knijp, German kneip. French canif "penknife" (mid-15c.) is borrowed from Middle English or Norse.
1865, from knife (n.). Related: Knifed; knifing.
Idioms and Phrases with under the knife
under the knife
Undergoing surgery, as in He was awake the entire time he was under the knife. The phrase is often put as go under the knife meaning “be operated on,” as in When do you go under the knife? Knife standing for “surgery” was first recorded in 1880.