jumper

noun

1.
a person who jumps
2.
an athlete who competes at jumping
3.
a crocheted or knitted garment covering the upper part of the body
sweater
Exemplifies:
British English
4.
a coverall worn by children
5.
a small connector used to make temporary electrical connections
6.
a loose jacket or blouse worn by workmen
7.
a sleeveless dress resembling an apron; worn over other clothing
pinafore pinny
8.
(basketball) a player releases the basketball at the high point of a jump
jump shot