"make a rattling sound," from Old English *clatrian (implied by late Old English verbal noun clatrung "clattering, noise"), of imitative origin. Compare Middle Dutch klateren, East Frisian klatern, Low German klattern "to clatter, rattle;" perhaps all are from PIE root *gal- "to call, shout." The noun is attested from mid-14c., from the verb. Related: Clattered; clattering.
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