jumper

Concise Oxford English Dictionary © 2008 Oxford University Press:
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 dial. jump ‘short coat’, perh. from Scots jupe ‘loose jacket or tunic’, via OFr. from Arab. jubba.

Concise Oxford English Dictionary © 2008 Oxford University Press:
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.