backer Syllabification: (back·er)Pronunciation: /ˈbakər/Translate backer | into French | into German | into Italian | into Spanish Definition of backer noun a person, institution, or country that supports something, especially financially:$3.3 million was provided by the project’s backers a person who bets on a horse. backer in other Oxford dictionaries Definition of backer in the British & World English dictionary