Meanings
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1
noun
a person or organization that supports a person, cause, or project, especially by providing money
The theater found a private backer willing to finance the new production.
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2
noun
a person who bets money on a competitor or outcome
Every backer of the favorite horse lost money when it finished third.
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3
noun
a supporter or assistant; historically, a bridegroom's best man
Pip served as backer, or best man, to the bridegroom.
Thesaurus
Etymology
Formed in the 16th century from back in its verbal sense 'to support' + the agent suffix -er. Financial and betting uses developed from the idea of standing behind a venture or contestant; Dickens also used the broader supporter sense for a bridegroom's attendant.