side bet

noun

1

: a bet made with a player other than a house that customarily books all bets or other than with the shooter (as in craps)

2

: a bet made by the shooter in craps on any event other than the outcome of his center bets

3

: a bet (as on whose hand holds the highest spade) made on an event not integral to the game being played

4

: a bet with another player in a game additional to the regular stakes for which the game (as in bridge or golf) is being played

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