jumper Definition

jumper¹
noun

1. A knitted garment for the top half of the body. N Amer equivalent sweater. See also pullover.
(N Amer)
2. A pinafore dress.

Etymology: 19c: from old word jump a short coat.

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jumper²
noun

1. A person or animal that jumps.
2. elec.
A short length of conductor (eg wire) used to make a temporary connection between two points on a circuit, or to allow current to flow around an open circuit.
3. engineering.
A heavy drill with a jumping motion, that works by repeated impact.