side bet

noun3

1. •
   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.

   • The fight lasted ten minutes and along with the championship of New Jersey, Banks won a side bet of $50. — 1938
2. •
   An investment or risk undertaken by a company that is not part of its core business.

   • They do this by attempting to ensure the success and development of a strong, secure but flexible business, but also by continually experimenting with 'side-bet' ventures. — 2009
3. •
   An investment of time, money, or resources that reinforces one's commitment to a course of action.

   • Side bets aren't always explicit, nor do they necessarily involve money. A side bet occurs anytime you do something that increases the consequences, or losses, of not staying with it. — 2014