jumper1
¦ noun
1. Brit. a pullover or sweater.
historical a sailor's loose outer jacket.
2. N. Amer. a pinafore dress.
Origin
C19: prob. from dialect jump 'short coat', perh. from Scots jupe 'loose jacket or tunic', via OFr. from Arab. jubba.
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jumper2
¦ noun
1. a person or animal that jumps.
2. (also jumper wire) a short wire used to shorten or close an electric circuit.
3. Nautical a rope made fast to keep a yard or mast from jumping.
4. a heavy chisel-ended iron bar for drilling blast holes.