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From: Webster's Revised Unabridged Dictionary (1913)

 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.