vigorish

A fee charged for the placement of bets by an illegal gambling broker or establishment.

Frequent and excessive interest payments charged by an illegal moneylender.

The payment of such fees or interest.

A charge taken on bets, as by a bookie or gambling establishment.

The interest on a loan of money, especially for loans made by a usurer or loan shark.

An amount owed on account of or payment of a bookie’s charge or of interest.

an exorbitant or unlawful rate of interest

a percentage (of winnings or loot or profit) taken by an operator or gangster