(jum′pər) noun
1. One who or that which jumps.
2. The larva of a cheese fly.
3. A piece of mechanism or a tool having a jumping motion.
4. A rude sled.
5. Electr. A wire used to cut out part of a circuit, or to close a temporary gap in it.
JUMPER DRESS
(def. 3)

(jum′pər) noun
1. Chiefly Brit. A loose outer jacket, often of coarse cloth, worn over or instead of other clothes, as to protect them from getting soiled.
2. A hooded fur jacket used by Eskimos and Arctic explorers.
3. A one-piece, sleeveless dress, usually worn with a blouse or sweater by women and children: also jumper dress. [Prob. alter. of OF juppe a jacket, ult. <Arabic jubbah a short coat]