One of the mysteries of the English language finally explained.
A sharp rapping or tapping sound, as produced by knocking on a door, hammering, etc.
Representing this sound.
no object To make a rapping sound, as on a door, etc.
Mid 18th century; earliest use found in Charles Johnson (?1679–1748), playwright and poet. From rap + tap. Compare later rap-tap<br>mid 19th century; earliest use found in Edward Capern (1819–1894), poet. From rap + tap, after rap-tap.
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