[clack] vb [ME, of imit. origin] vi (13c) 1: chatter, prattle
2: to make an abrupt striking sound or series of sounds 3 of fowl: cackle, cluck ~ vt 1: to cause to make a clatter
2: to produce with a chattering sound; specif: blab -- clack.er n
[2]clack n (15c) 1 a: rapid continuous talk: chatter b: tongue
2. archaic: an object (as a valve) that produces clapping or rattling noises usu. in regular rapid sequence
3: a sound of clacking "the ~ of a typewriter"