A bribe.
In a transaction, something extra on the side.
A handout.
A tip or gratuity.
Something (usually money) given in exchange for influence or as an inducement to breaking the law.
That which seduces; seduction; allurement.
To give a bribe to; specifically, to ask a person to do something against his/her original will, in exchange for some type of reward or relief from potential trouble.
To gain by a bribe; to induce as by a bribe.