side bet
Noun
Meaning
(gambling) A bet on some aspect of a game or competition that is not the main bet of the game or the prize of the competition; proposition bet.
(business) An investment or risk undertaken by a company that is not part of its core business.
(sociology) An investment of time, money, or resources that reinforces one's commitment to a course of action.
Source: en.wiktionary.orgSynonyms
Examples
A player wishing to wager on a side bet is usually required to place a wager on blackjack.
Fortune Pai Gow is another variation which allows players to make a side bet on a poker hand ranking of trips or better.
A non-controlling player of a blackjack hand is usually permitted to place a side bet regardless of whether the controlling player does so.
Blackjack games almost always provide a side bet called insurance, which may be played when dealer's upcard is an ace.
Pai Gow Mania was the first variation to be created which allows for two side bets instead of the traditional one side bet per hand.
Similar to fortune pai gow, is emperors challenge which also allows a side bet on a 7 card pai gow (no hand).