jumper

In the U.K., a knitted garment worn on the upper half of the body (as Iain said, what Americans call a sweater).

"wish you would step off of that ledge, my friend,
you have capsized the ship of lies that you've been living in"

Third Eye Blind-Jumper

Dark Humor

• A jumper is a sweater -- a colourful garment you put on top of something else.
• A thin wire (an electrical lead) coated with some colourful plastic insulation is a "jumpered lead", or (in short) a "jumper", because it's a wire which is wearing a sweater.
• During industrial PCB design (e.g. on a computer's circuit board), single wires added after printing are called "jumpers", because they really are jumpers.
• Optional wires you connect to configure some portion of your circuit board are such jumpers.
• The black plastic dingus is invented; it's a short inflexible lead, which lets you configure some portion of your circuit board, so it must be a jumper.

Jump"er (?), n.

1.

One who, or that which, jumps.

2.

A long drilling tool used by masons and quarrymen.

3.

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.

4. (Zoöl.)

The larva of the cheese fly. See Cheese fly, under Cheese.

5. (Eccl.)

A name applied in the 18th century to certain Calvinistic Methodists in Wales whose worship was characterized by violent convulsions.

6. (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.

© Webster 1913

Jump"er, n. [See 1st Jump.]

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.

© Webster 1913

Jump"er, n.

A thing that jumps; esp., any of various tools or other contrivances operating with a jumping motion; as, (Mining, Quarrying, etc.),

an instrument for boring holes in rocks by percussion without hammering, consisting of a bar of iron with a chisel-edged steel tip at one or both ends, operated by striking it against the rock, turning it slightly with each blow.

© Webster 1913