(1932–70), American boxer; born Charles Liston. In 1962 he became world heavyweight champion but in 1964 lost his title to Muhammad Ali (then Cassius Clay).
Definition of Liston, Sonny in US English:
Liston, Sonny
proper nounˈlistən
(1932–70), US heavyweight boxing champion; born Charles Liston. He defeated Floyd Patterson for the world heavyweight championship in 1962 but lost the title to Muhammad Ali (then Cassius Clay) in 1964.