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The Collaborative International Dictionary of English v.0.48 (gcide)

Knife \Knife\ (n[imac]f), n.; pl. {Knives} (n[imac]vz). [OE.
knif, AS. cn[imac]f; akin to D. knijf, Icel. kn[imac]fr, Sw.
knif, Dan. 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..
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2. A sword or dagger.
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The coward conquest of a wretch's knife. --Shak.
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{Knife grass} (Bot.) 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.
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Knife \Knife\, v. t. [imp. & p. p. {Knifed}; p. pr. & vb. n.
{Knifing}.]
1. (Hort.) To prune with the knife.
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2. To cut or stab with a knife. [Low]
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3. Fig.: 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, U. S.]
[Webster 1913 Suppl.]