knife

[ nahyf ]
/ naɪf /

noun, plural knives [nahyvz] /naɪvz/.

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.

verb (used with object), knifed, knif·ing.

to apply a knife to; cut, stab, etc., with a knife.
to attempt to defeat or undermine in a secret or underhanded way.

verb (used without object), knifed, knif·ing.

to move or cleave through something with or as if with a knife: The ship knifed through the heavy seas.

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Idioms for knife

    under the knife, in surgery; undergoing a medical operation: The patient was under the knife for four hours.

Origin of knife

before 1100; Middle English knif, Old English cnīf; cognate with Dutch knijf, German Kneif, Old Norse knīfr

OTHER WORDS FROM knife

knife·like, adjectiveknif·er, noun
Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2020

Example sentences from the Web for knife

British Dictionary definitions for knife

knife
/ (naɪf) /

noun plural knives (naɪvz)

verb (tr)

to cut, stab, or kill with a knife
to betray, injure, or depose in an underhand way

Derived forms of knife

knifelike, adjectiveknifer, noun

Word Origin for knife

Old English cnīf; related to Old Norse knīfr, Middle Low German knīf
Collins English Dictionary - Complete & Unabridged 2012 Digital Edition © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009, 2012

Idioms and Phrases with knife

knife

see at gunpoint (knifepoint); under the knife; you could cut it with a knife.

The American Heritage® Idioms Dictionary Copyright © 2002, 2001, 1995 by Houghton Mifflin Harcourt Publishing Company. Published by Houghton Mifflin Harcourt Publishing Company.