Webster's Revised Unabridged Dictionary · 1913

Knife

Knife (nīf) , noun

[Old English knif, Anglo-Saxon cnīf; akin to Dutch knijf, Icelandic knīfr, Swedish knif, Danish kniv.]

1.
An instrument consisting of a thin blade, usually of steel and having a sharp edge for cutting, fastened to a handle, but of many different forms and names for different uses; as, table knife, drawing knife, putty knife, pallet knife, pocketknife, penknife, chopping knife, etc..
2.
A sword or dagger.
The coward conquest of a wretch's knife. — Shakespeare
Collocations (2)
Knife grass (Botany) , a tropical American sedge (Scleria latifolia), having leaves with a very sharp and hard edge, like a knife.
War to the knife , mortal combat; a conflict carried to the last extremity.

Knife , transitive verb

1.
(Horticulture) To prune with the knife.
2.
To cut or stab with a knife. [Low]
3.
Figuratively: To stab in the back; to try to defeat by underhand means, esp. in politics; to vote or work secretly against (a candidate of one's own party). [Slang, United States]