kickback

noun

1. 1.A backward kick, a retrograde movement of an extremity.
2. 2.A covert – often illegal – payment in return for a favor consisting of providing an opportunity of chargeable transaction.
3. 3.(machinery) Recoil; a sudden backward motion, usually in the direction of the operator.
4. 4.(machinery) An accident wherein an object being cut by a rotating blade or disk, such as a circular saw, is caught by the blade and thrown outward.
5. 5.A dangerous buildup of gas pressure at the wellhead.