Clack, n.
 1. A sharp, abrupt noise, or succession of noises, made by striking an object.
 2. Anything that causes a clacking noise, as the clapper of a mill, or a clack valve.
 3. Continual or importunate talk; prattle; prating.
    Whose chief intent is to vaunt his spiritual clack.   --South.
 Clack box Mach., the box or chamber in which a clack valve works.
 Clack dish, a dish with a movable lid, formerly carried by beggars, who clacked the lid to attract notice.
 Clack door Mining, removable cover of the opening through which access is had to a pump valve.
 Clack valve Mach., a valve; esp. one hinged at one edge, which, when raised from its seat, falls with a clacking sound.

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 Clap n.
 1. A loud noise made by sudden collision; a bang. “Give the door such a clap, as you go out, as will shake the whole room.”
 2. A burst of sound; a sudden explosion.
    Horrible claps of thunder.   --Hakewill.
 3. A single, sudden act or motion; a stroke; a blow.
    What, fifty of my followers at a clap!   --Shak.
 4. A striking of hands to express approbation.
    Unextrected claps or hisses.   --Addison.
 5. Noisy talk; chatter. [Obs.]
 6. Falconry The nether part of the beak of a hawk.
 Clap dish. See Clack dish, under Clack, n.
 Clap net, a net for taking birds, made to close or clap together.