- (clack) a sharp abrupt noise as if two objects hit together; may be repeated
- (clack) clatter: make a rattling sound; "clattering dishes"
- (clack) cluck: make a clucking sounds, characteristic of hens
- clack valve: a simple valve with a hinge on one side; allows fluid to flow in only one direction
- (clack) chatter: speak (about unimportant matters) rapidly and incessantly
- The technology depicted in Terry Pratchett's Discworld novels takes two forms: magical and mechanical. ...
- Clack can refer to numerous people: * Boyd Clack, Welsh writer, actor and musician. * Brenda Clack, politician. * Barbara Cooper Clack, world water skiing champion * Darryl Clack, player of American football for the Dallas Cowboys in 1986
* H. ...
- a fictional series of semaphore towers in the Discworld novels
- (clack) an abrupt, sharp sound, especially one made by two hard objects colliding repetitively; a clatter; in sound, midway between a click and a clunk; chatter; to make such a sound; to chatter