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The Collaborative International Dictionary of English v.0.48 (gcide)

Clack \Clack\, v. t.
1. To cause to make a sudden, sharp noise, or succession of
noises; to click.
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2. To utter rapidly and inconsiderately. --Feltham.
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{To clack wool}, to cut off the sheep's mark, in order to
make the wool weigh less and thus yield less duty. [Eng.]
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Clack \Clack\, n. [Cf. F. claque a slap or smack, MHG. klac
crack, W. clec crack, gossip. See {Clack}, v. t.]
1. A sharp, abrupt noise, or succession of noises, made by
striking an object.
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2. Anything that causes a clacking noise, as the clapper of a
mill, or a clack valve.
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3. Continual or importunate talk; prattle; prating.
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Whose chief intent is to vaunt his spiritual clack.
--South.
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{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. --Shak.
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{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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Clack \Clack\, v. i. [imp. & p. p. {Clacked}; p. pr. & vb. n.
{Clacking}.] [Prob. of imitative origin; cf. F.claquer to
clap, crack, D. klakken, MHG. klac crack, Ir. clagaim I make
a noise, ring. Cf. {Clack}, n., {Clatter}, {Click}.]
1. 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.
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We heard Mr.Hodson's whip clacking on the ahoulders
of the poor little wretches. --Thackeray.
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2. To utter words rapidly and continually, or with
abruptness; to let the tongue run.
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