@RexRed,
Quote:In American English a clapper is one who claps a lo
A clapper can be a person who claps, a bird-scaring device, or the small piece of metal suspended within a bell that causes it to sound when made to strike against its side.
A clapper bridge is so called because the word 'clapper' derives ultimately from an Anglo-Saxon word, cleaca, meaning 'bridging the stepping stones' the Oxford English Dictionary gives the intermediate Medieval Latin form clapus, claperius, "of Gaulish origin", with an initial meaning of "a pile of stones".