Definition of "cluck"

cluck

/klʌk/

noun
plural clucks
1. The sound made by a hen, especially when brooding, or calling her chicks.
2. Any sound similar to this.
3. A kind of tongue click used to urge on a horse.
verb
third-person singular simple present clucks, present participle clucking, simple past and past participle clucked
1. (intransitive) To make such a sound.
  Quotations
  "I came across him once," he continued, "when he was playing down on the main road to Skaug; there he sat in the middle of the road with a lot of hens around him, I counted seven, and there were more round about in the wood, for I heard them clucking and calling behind every bush."
  1886, Peter Christen Asbjørnsen, translated by H.L. Brækstad, Folk and Fairy Tales, page 72
2. (transitive) To cause (the tongue) to make a clicking sound.
3. To call together, or call to follow, as a hen does her chickens.
  Quotations
  When she, poor hen, fond of no second brood,Has clucked thee to the wars and safely home.
  c. 1608–1609 (date written), William Shakespeare, “The Tragedy of Coriolanus”, in Mr. William Shakespeares Comedies, Histories, & Tragedies […] (First Folio), London: […] Isaac Iaggard, and Ed[ward] Blount, published 1623, [Act V, scene iii]
4. (Britain, drug slang) to suffer withdrawal from heroin.