I. ˈklak verb
Etymology: Middle English, of imitative origin
Date: 13th century
intransitive verb
1. : chatter , prattle
2. : to make an abrupt striking sound or series of sounds
3. of fowl : cackle , cluck
transitive verb
1. : to cause to make a clatter
2. : to produce with a chattering sound ; specifically : blab
• clack·er noun
II. noun
Date: 15th century
1.
a. : rapid continuous talk : chatter
b. : tongue
2. archaic : an object (as a valve) that produces clapping or rattling noises usually in regular rapid sequence
3. : a sound of clacking
the clack of a typewriter