tapper englannista kaikille kielille - Sanakirja.org (englanti-*)

One who makes a tapping noise.
A tap-dancer.
A wiretapper.
(baseball, slang) A weakly hit ground ball.
(telegraphy) In early wireless telegraphs, a device used to shake loose the filings of a coherer.
(British, dialect) The lesser spotted woodpecker.
(US) A tapster.
(sports) An assistant in the sport of paraswimming who taps blind or visually impaired swimmers with a pole to indicate when they should turn around.

A low tap was heard at the room door. Mr. Bob Sawyer looked expressively at his friend, and bade the tapper come in[...]

Monikko