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

Knife \Knife\, v. t. [imp. & p. p. {Knifed}; p. pr. & vb. n.
{Knifing}.]
1. (Hort.) To prune with the knife.
[1913 Webster]

2. To cut or stab with a knife. [Low]
[1913 Webster]

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.]