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1a person or animal that jumps: the horse should be a better jumper this season other players in the line-out may only move when the jumper has touched the ball an Olympic jumper
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2 (also jumper wire) a short wire used to shorten an electric circuit or close it temporarily.
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3 Nautical a rope made fast to keep a yard or mast from jumping.
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4a heavy chisel-ended iron bar for drilling blast holes.
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5a mushroom-shaped brass part in a tap which supports the washer.