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Old English clæppan "to throb, beat," common West Germanic, echoic (cf. Old Frisian klapa "to beat," Old Norse klappa, Old High German klaphon, German klappen, Old Saxon klapunga). Meaning "to strike or knock" is from c.1300. Meaning "to make a sharp noise" is late 14c. Of hands, to beat them together to get attention or express joy, from late 14c. To clap (someone) on the back is from 1520s. Related: Clapped; clapping.
"loud noise," c.1200, from clap (v.). Of thunder, late 14c. Meaning "sudden blow" is from c.1400; meaning "noise made by slapping the palms of the hands together" is from 1590s.
"gonorrhea," 1580s, of unknown origin, perhaps from Middle English clapper "rabbit-hole," from Old French clapoire (Modern French clapier), originally "rabbit burrow" (of uncertain origin), but given a slang extension to "brothel" and also the name of a disease of some sort. In English originally also a verb, "to infect with clap." Related: Clap-doctor.
Gonorrhea. Often used with the.