clack

1a :  rapid continuous talk :  chatterb :  tongue

2 archaic :  an object (such as a valve) that produces clapping or rattling noises usually in regular rapid sequence

3 :  a sound of clacking the clack of a typewriter

1 :  to talk rapidly and without stopping

2 :  to make or cause to make a short sharp sound … suddenly he began to shiver … I could hear his teeth clacking. — Theodore Taylor, The Cay

1 :  rapid continuous talk The disc jockey's clack went on all morning.

2 :  a sound of clacking the clack of a typewriter