• WordNet 3.6
    • v clack speak (about unimportant matters) rapidly and incessantly
    • v clack make a clucking sounds, characteristic of hens
    • v clack make a rattling sound "clattering dishes"
    • n clack a simple valve with a hinge on one side; allows fluid to flow in only one direction
    • n clack a sharp abrupt noise as if two objects hit together; may be repeated
    • ***
Webster's Revised Unabridged Dictionary
    • Clack A sharp, abrupt noise, or succession of noises, made by striking an object.
    • Clack Anything that causes a clacking noise, as the clapper of a mill, or a clack valve.
    • Clack Continual or importunate talk; prattle; prating. "Whose chief intent is to vaunt his spiritual clack ."
    • Clack To cause to make a sudden, sharp noise, or succession of noises; to click.
    • Clack 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. "We heard Mr.Hodson's whip clacking on the ahoulders of the poor little wretches."
    • Clack To utter rapidly and inconsiderately.
    • Clack To utter words rapidly and continually, or with abruptness; to let the tongue run.
    • ***
Century Dictionary and Cyclopedia
    • clack To make a quick sharp noise, or a succession of sharp sounds, as by striking or cracking; crack; rattle; snap.
    • clack To utter sounds or words rapidly and continually, or with sharpness and abruptness; let the tongue run or rattle.
    • clack To cause to make a sharp, short, snapping sound; rattle; clap: as, to clack two pieces of wood together.
    • clack To speak without thought; rattle out.
    • n clack A sharp, repeated, rattling sound; clatter: as, the clack of a mill.
    • n clack In a grist-mill: That part of the mill that strikes the hopper, to move or shake it, for discharging its contents.
    • n clack A bell that rings when more corn is required to be put in the hopper.
    • n clack A valve of a pump.
    • n clack A ball-valve connected with the boiler of a locomotive. See ball-ralve and clack-box, 2.
    • n clack A kind of small windmill with a clapper, set on the top of a pole to frighten away birds. Also called clack-mill, and formerly clacket.
    • n clack Continual talk; prattle; gossip; tattle.
    • clack To cluck or cackle, as a hen.
    • ***
Chambers's Twentieth Century Dictionary
    • v.i Clack klak to make a sudden sharp noise as by striking: to chatter: to cackle
    • n Clack a sharp, sudden sound; sound of voices: an instrument making this kind of noise:
    • n Clack (coll.) the tongue
    • ***


Webster's Revised Unabridged Dictionary
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


In literature:

Then followed another cheer for the school eleven, with a tooting of horns and a clacking of wooden rattles.
"Dave Porter and His Rivals" by Edward Stratemeyer
I won't stand for any nasty clack.
"Cavanaugh: Forest Ranger" by Hamlin Garland
He was still kneeling by the bed, talking in this way, when Dr. Clack, the school doctor, entered.
"The Hero of Garside School" by J. Harwood Panting
I heard the sharp clack of hoofs, and, looking back, I saw a man riding as if it were his aim to overtake me.
"The Jucklins" by Opie Read
The train was going slower, clack-clack ... clack-clack ... clack; clack ... cuh-lack ...
"It Could Be Anything" by John Keith Laumer
The Benham private car had clacked eastward over the rails three weeks before, bearing with it as a passenger only the negro autocrat.
"'Firebrand' Trevison" by Charles Alden Seltzer
Then, while the rifle click-clacked in Hetty's hands, Torrance stood by the window holding up a handkerchief.
"The Cattle-Baron's Daughter" by Harold Bindloss
The monotonous click-clack of the horses' feet lulled the tired child into blissful drowsiness.
"Christopher Hibbault, Roadmaker" by Marguerite Bryant
They could hear the clack!
"The Irish Twins" by Lucy Fitch Perkins
The click-clack of axes began, and slender columns of pale blue smoke stole softly into the air.
"The Trail of the Goldseekers" by Hamlin Garland

In poetry:

"So fast they go–clack, clack, clack, clack;
Now listen well, I pray,
And let me see you both improve
From what I've said to-day."
"When We Went Out With Grandmamma" by Kate Greenaway
Hear them clack of my haste to greet him!
No one other my mouth had kissed.
I had dressed me in silk to meet him-
False young Death would not hold the tryst.
"The Trifler" by Dorothy Parker
All day, all day, round the clacking net
The weaver's fingers fly:
Gray dreams like frozen mists are set
In the hush of the weaver's eye;
A voice from the dusk is calling yet,
"Oh, come away, or we die!"
"The Weaver" by Archibald Lampman
The lonely sailor on far-off seas; and the grey-
minded scholar in his book-room;
The mill-hand bound to a clacking machine; and
the hunter in the forest;
And the solitary soul hiding friendless in the
wilderness of the city;
"Longfellow" by Henry Van Dyke
O, hits time fur de grin'in' ur de co'n,
Run 'long, honey, an' git yo' sack — ("Clack, clack," de mill wheel say,)
An' put hit on ol' Betsy's back — ("Clack, clack," de mill wheel say,)
O, hits time fur de grin'in' ur de co'n.
"Song Of The Corn" by James Edwin Campbell
O, hits time fur de grin'in' ur de co'n,
Des ride five mile ur roun' de hill — ("Clack, clack," de mill wheel say,)
Den dump yo' load at Thompson's mill — ("Clack, clack," de mill wheel say,)
O, hits time fur de grin'in' ur de co'n.
"Song Of The Corn" by James Edwin Campbell

In news:

The clickety-clack of hand-loom knitting machines echoes through the downtown L.A.
The Mets are clacking along to nowhere.
HONG KONG – As the Peak Tram click-clacks its way out of the steel and glass maze of Hong Kong Central toward the summit of Victoria Peak, it passes under concrete bridges supporting streets in the residential area called the Mid-levels.
An image of Baltimore Fire Chief James Clack's face in a toilet bowl and.
CLICK AND CLACK TALK CARS Turn signals can fail intermittently .
Click & Clack Talk Cars: It can get complex nowadays under hood.
Tommy Clack has a long list of victims.
Investigators finally caught up with Tommy Clack over the weekend in South Carolina.
Tommy Edward Clack (Image courtesy N.C. Department of Justice).
Tommy Edward Clack - a driveway paver who's been the subject of ABC11 I-Team Troubleshooter reports - continues to do paving work despite a statewide ban Attorney General Roy Cooper's office said Thursday.
Tommy Clack, the Annapolis paver at the center of an ABC2 News investigation, has been indicted in Howard County.
I can see that neither the corner suites of corporate America nor the halls of Congress echo with the clacking of heels.
Whether it's the clacking of the Orange Line as it comes above ground or the unmistakable screeching of a B train pulling into Park Street, there's a rhythm to the T.
Walling outspending Clack in Flint mayor's race.
Mayoral candidate Dayne Walling has spent four times more on his campaign than rival Brenda Clack this election season.