What does "jumper" mean?

Additional senses

1. 2.A rude kind of sleigh; -- usually, a simple box on runners which are in one piece with the poles that form the thills. [U.S.] J. F. Cooper.
2. 3.(Zoöl.) The larva of the cheese fly. See Cheese fly, under Cheese.
3. 4.(Eccl.) A name applied in the 18th century to certain Calvinistic Methodists in Wales whose worship was characterized by violent convulsions.
4. 5.(Horology) spring to impel the star wheel, also a pawl to lock fast a wheel, in a repeating timepiece. Baby jumper. See in the Vocabulary. -- Bounty jumper. See under Bounty.
5. 6.A loose upper garment; as: (a) A sort of blouse worn by workmen over their ordinary dress to protect it. (b) A fur garment worn in Arctic journeys.