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rap-tap1
(also rap-a-tap)
noun
A sharp rapping or tapping sound, as produced by knocking on a door, hammering, etc.
exclamation
Representing this sound.
Origin
Mid 18th century; earliest use found in Charles Johnson (?1679–1748), playwright and poet. From rap + tap.
verb
To make a rapping sound, as on a door, etc.
Origin
Mid 19th century; earliest use found in Edward Capern (1819–1894), poet. From rap + tap, after rap-tap.
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