n. One who, or that which, raps or knocks; specifically, the knocker of a door.n. A performer of rap musicn. A forcible oath or lie.n. obsolete: Scottish English word for "sword."n. A flexible strip of metal, 45-60cm long, with handles at each end, used for Northumbrian rapper sword dancing.n. A mechanical, or later electric, signalling device formerly used in the mines of north-eastern England to signal to the engineman that the cages carrying men or coals up and down the shaft were ready to be raised or lowered.