knifing
  切割; 切深
  Knife, v. t. [imp. & p. p. Knifed p. pr. & vb. n. Knifing ]
  1. Hort. To prune with the knife.
  2. To cut or stab with a knife. [Low]
  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.]
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