money under the table
- bribeIllicit payment for favor
- kickbackIllegal payment for services
- payoffCulminating benefit received
- corruptionDishonest abuse of power
- hush moneyPayment to ensure secrecy
cash · envelope · secret · illegal · untaxed · backroom · deal · grease · palm · slush fund · shady · handshake · off the books · favor · scheme · graft · underhanded · dirty money