vt to utter rapidly and inconsiderately.
2. clack ·vt continual or importunate talk; prattle; prating.
3. clack ·noun to utter words rapidly and continually, or with abruptness; to let the tongue run.
4. clack ·vt anything that causes a clacking noise, as the clapper of a mill, or a clack valve.
5. clack ·vt to cause to make a sudden, sharp noise, or succession of noises; to click.
6. clack ·vt a sharp, abrupt noise, or succession of noises, made by striking an object.
7. clack ·noun to make a sudden, sharp noise, or a succesion of such noises, as by striking an object, or by collision of parts; to rattle; to click.