He earned a lot of money by organizing prizefighting events.

prizefighting 是由 prize（奖金）和 fighting（打斗）组成的复合词。prize 指"奖金、奖品"，fighting 指"打斗、搏斗"。 prizefighting 特指"职业拳击比赛"，这种比赛中获胜者会获得奖金，区别于业余拳击比赛。