knife

1 of 2

noun

ˈnīf 

plural knives ˈnīvz 

often attributive

1

a

: a cutting instrument consisting of a sharp blade fastened to a handle

b

: a weapon or tool resembling a knife

2

: a sharp cutting blade or tool in a machine

3

: surgery sense 4

—usually used in the phrase under the knife

knifelike

ˈnīf-ˌlīk 

adjective

knife

2 of 2

verb

knifed; knifing

transitive verb

1

: to use a knife on

specifically : to stab, slash, or wound with a knife

2

: to cut, mark, or spread with a knife

3

: to try to defeat by underhanded means

4

: to move like a knife in

birds knifing the autumn sky

intransitive verb

: to cut a way with or as if with a knife blade

the cruiser knifed through the heavy seas

Synonyms

Noun

• cutter
• blade
• dagger

Examples of knife in a Sentence

Noun

Each dinner guest gets two forks, a knife, and a spoon.

He pulled a knife on me and threatened to stab me with it.

Verb

He died after being knifed in the chest.

ships knifing through the waves

Recent Examples on the Web

Noun

Cut corn kernels from the cob using a sharp knife; discard cobs. —Katlyn Moncada, Better Homes & Gardens, 11 July 2025

The employee went home but then returned with a kitchen knife and stabbed Harris multiple times shortly before 8 a.m., police said. —Jordan King, MSNBC Newsweek, 11 July 2025

Verb

As pink soldiers begin removing the dead from the hide-and-seek room, a red player attempts to knife a soldier. —Jennifer Zhan, Vulture, 27 June 2025

Ferguson turned to his new victim, knifing him in the upper body and buttocks. —Thomas Tracy, New York Daily News, 20 June 2025

Word History

Etymology

Noun

Middle English knif, from Old English cnīf, perhaps from Old Norse knīfr; akin to Middle Low German knīf knife

First Known Use

Noun

before the 12th century, in the meaning defined at sense 1a

Verb

1865, in the meaning defined at transitive sense 1

Phrases Containing knife

• bowie knife
• butter knife
• carving knife
• case knife
• chef's knife
• clasp knife
• flick-knife
• going under the knife
• go under the knife
• knife-edge
• like a (hot) knife through butter
• on a/the knife-edge
• palette knife
• paper knife
• paring knife
• putty knife
• sheath knife
• so thick you could cut it with a knife
• steak knife
• switch knife
• twist/turn the knife (in the wound)
• utility knife
• you could cut it with a knife

Rhymes for knife

• life
• rife
• strife
• wife
• afterlife
• pocketknife
• alewife
• birdlife
• folklife
• housewife
• jackknife
• loosestrife

Kids Definition

knife

1 of 2 noun

ˈnīf 

plural knives ˈnīvz 

1

: a cutting instrument consisting of a sharp blade fastened to a handle

2

: a cutting blade in a machine

knife

2 of 2 verb

knifed; knifing

1

: to stab, slash, or wound with a knife

2

: to move like a knife

ships knifing through the sea

Medical Definition

knife

noun

ˈnīf 

plural knives ˈnīvz 

1

: any of various instruments used in surgery primarily to sever tissues: as

a

: a cutting instrument consisting of a sharp blade attached to a handle

b

: an instrument that cuts by means of an electric current

2

: surgery sense 3

—usually used in the phrase under the knife

went under the knife yesterday

was afraid of the knife