From The Collaborative International Dictionary of English v.0.48:

kickback \kick"back`\, n.
   1. recoil, of a gun or machine, as in older automobile
      engines when started by turning a crank.

   2. A secret, and usually illegal, payment, by a recipient of
      money paid for goods or services, to a facilitator of the
      transaction, of a portion of that money; specifically, any
      portion of a gain made by the seller in a commercial
      transaction which is returned surreptitiously and
      illegally to a person (such as a purchasing agent) who
      authorized or recommended the purchase. It is generally
      considered a form of bribe.
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