Etymology
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knife (n.)

"hand-held cutting instrument consisting of a short blade and handle," late Old English cnif, probably from Old Norse knifr "knife, dirk," from Proto-Germanic *knibaz (source also of Middle Low German knif, Middle Dutch cnijf, German kneif), a word of uncertain origin. To further confuse the etymology, there also are forms in -p-, such as Dutch knijp, German kneip. French canif "penknife" (mid-15c.) is probably of Germanic origin, perhaps from Frankish. For pronunciation, see kn-.

knife (v.)

1865, "stab or kill with a knife," from knife (n.). Intransitive meaning "move as a knife does" is from 1920. Related: Knifed; knifing.

updated on March 02, 2017

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Definitions of knife from WordNet
1
knife (n.)
edge tool used as a cutting instrument; has a pointed blade with a sharp edge and a handle;
knife (n.)
a weapon with a handle and blade with a sharp point;
knife (n.)
any long thin projection that is transient;
rifles exploded quick knives of fire into the dark
Synonyms: tongue
2
knife (v.)
use a knife on;
The victim was knifed to death
Synonyms: stab
Etymologies are not definitions. From wordnet.princeton.edu, not affiliated with etymonline.