- a person who makes a business of accepting the bets of others on the outcome of sports contests, especially of horse races.
- a person who makes books.
- a person who as an occupation accepts bets, esp on horseraces, and pays out to winning betters
also book-maker, 1510s, “printer and binder of books,” from (n.) + agent noun from (v.). The wagering sense is from 1862. Related: Book-making (late 15c., betting sense 1824).