Definitions of pay-off
(informal) a payment made to someone, especially on leaving a job or as a bribe (=money or something valuable that you give to someone to persuade them to do something for you, usually something dishonest)
He received a pay-off of £600,000 when he resigned from his position.
something that you get in return for something else, especially for something that you would not otherwise have done or which has caused you some cost, loss, or effort etc
But the risk is that the pay-off may be slow in coming.
the money made on an investment or a bet
The scheme will equire considerable investment from the partners, but the potential pay-offs are thought to be well worth it.