Welsher

(n.) One who cheats at a horse race; one who bets, without a chance of being able to pay; one who receives money to back certain horses and absconds with it.

Thesaurus Entries

clock watcher, defaulter, delinquent, eye-servant, goldbrick, goldbricker, levanter, malingerer, nonpayer, old soldier, shirk, shirker, skulk, skulker, slacker, soldier, tax dodger, tax evader, truant