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Definition of backer : One who, or that which, backs; especially one who backs a person or thing in a contest.

Synonyms:

high priest, guaranty, supporter, source, protagonist, ally, herald, promoter, espouser, surety, contributor, apostle, confederate, disciple, law, white knight, Indian giver, expounder, partisan, proponent, sympathizer, patron, champion, donor, meal ticket, holy man, guarantor, paymaster, help, gospeler, adherent, bedfellow, supplier, tub-thumper, support, payer, friend, paladin, underwriter, fellow traveler, booster, advocator, holy person, saint, true believer, a good/bad/big etc. tipper, angel, study at sponsor, aid, hierophant, sponsor, advocate

attorney, patsy, abettor, henchman, hireling, aide-de-camp, proxy, junior, benefactor, associate, acolyte, underling, functionary, flunky, ancillary, accessory, chaperone, auxiliary, attendant, accomplice, helpmate, adjunct, agent, helper, servant, employee, aide, laborer, aider, stooge, minion, partner, subordinate, lieutenant, follower, assistant, deputy, menial, second, extra

Usage examples:

• But in a modified version, it has become the germ of a theory of heredity of which J. T. Cunningham, of Oxford, is the chief backer. - "The Glands Regulating Personality", Louis Berman, M.D..
• Thus did Mr. Twist artfully obtain a free hand as financial backer of The Open Arms. - "Christopher and Columbus", Countess Elizabeth Von Arnim.
• This is his house, you know, and he is the financial backer of Manton Pictures, yet there seems to be an undercurrent of friction between Manton and himself. - "The Film Mystery", Arthur B. Reeve.