- a person who supports or gives help, as to a protégé or undertaking; patron; sponsor
- a person who bets on a contestant
- One that backs a person, group, or enterprise: financial backers of a ballet company.
- One who bets on a contestant.
- One who provides or works with backs or backing.
- One who, or that which, backs; especially one who backs a person or thing in a contest.
back + -er