"a sharp, repeated, rattling sound," mid-15c., from clack (v.).
"make a quick, sharp noise," mid-13c., not in Old English, from Old Norse klaka "to chatter," of echoic origin. Compare Dutch klakken "to clack, crack," Old High German kleken, French claquer "to clap, crack (see claque). Related: Clacked; clacking.
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