jumper:
(plural: ‘jumpers‘)

a jumper in action
a person who jumps, especially a sports-person who jumps over some obstacles or distance for sport;
(in informal Irish English usage) a person who changes his/her religion; a convert,

a religion jumper (Jamilah Kolocotronis — jumping from Christianity to Islam)
When the sports instructor noticed that Ron was running and jumping well, he started coaching Ron to become a high jumper.
The Olympic long jumper Susan was encouraged by her high school teacher and began to practise as a long jumper and finally won a silver medal for long jump in the Olympics.
There are jumpers of all kinds: jumpers who jump from one idea to another, one job to another and one club to another.
There are some religious ‘jumpers’: those who ‘jump’ when they say their prayers, and those who ‘jump’ (convert) from one religion to another.

a jumper (clothing)
