I. jump·er ˈjəm-pər noun
Date: 1611
1. : a person who jumps
2.
a. : any of various devices operating with a jumping motion
b. : any of several sleds
c. : a connection used to close a break or cut out part of a circuit
3. : any of several jumping animals ; especially : a saddle horse trained to jump obstacles
4. : jump shot
II. jum·per ˈjəm-pər noun
Etymology: probably from English dialect jump jumper
Date: 1850
1. : a loose blouse or jacket worn by workmen
2. : a sleeveless one-piece dress worn usually with a blouse
3. : a child's coverall — usually used in plural
4. chiefly British : sweater 2a