CLACK

I. verb Etymology: Middle English, of imitative origin Date: 13th century intransitive verb chatter , prattle , to make an abrupt striking sound or series of sounds, cackle , cluck , transitive verb to cause to make a clatter, to produce with a chattering sound, ~er noun II. noun Date: 15th century 1. rapid continuous talk ; chatter , tongue , an object (as a valve) that produces clapping or rattling noises usually in regular rapid sequence, a sound of ~ing