a percentage of income given to a person in a position of power or influence as payment for having made the income possible

usually considered improper or unethical.

a rebate, usually given secretively by a seller to a buyer or to one who influenced the buyer.

the practice of an employer or a person in a supervisory position of taking back a portion of the wages due workers.

a response, usually vigorous.

a sudden, uncontrolled movement of a machine, tool, or other device, as on starting or in striking an obstruction

A kickback from a chain saw can be dangerous.

noun

cut , gift , graft , money under the table , oil * , payment , payoff , payola , percentage , recompense , reward , share , bribe , repercussion