A person who knocks on doors, a swinging knocker used in mining, or a spiritualistic medium who communicates with spirits through knocking sounds.
(music) A performer of rap music, or someone who raps in any form of music.
A flexible strip of metal, 45-60cm long, with handles at each end, used for Northumbrian rapper sword dancing.
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.