Or they offer a craps game where the dice are manipulated in some way where the rolls were predetermined. If the exact payouts for a game aren't listed either on the layout for a table game, or in the options menu of a slot machine, that is a major red flag that things might not be on the up and up.
transitive verb. If someone rigs an election, a job appointment, or a game, they dishonestly arrange it to get the result they want or to give someone an unfair advantage. She accused her opponents of rigging the vote.