Wordnet 3.0
NOUN (1)
1. 
 a percentage (of winnings or loot or profit) taken by an operator or gangster; 
[syn: rake-off, vigorish]
WordNet (r) 3.0 (2006):
rake-off
    n 1: a percentage (of winnings or loot or profit) taken by an
         operator or gangster [syn: rake-off, vigorish]