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See also: COO



Pigeons in the Kadıköy district of Istanbul, Turkey. The sound made by these birds is usually described as a coo.

Etymology 1[edit]

Onomatopoeic; compare Dutch koeren.


coo (plural coos)

  1. The murmuring sound made by a dove or pigeon.
    • 1979, Mei-Fang Cheng, “Progress and Prospects in Ring Dove Research: A Personal View”, in Jay S[eth] Rosenblatt, Robert A[ubrey] Hinde, Colin Beer, and Marie-Claire Busnel, editors, Advances in the Study of Behavior, volume 9, New York, N.Y.; London: Academic Press, →ISBN, section III (Hormones and Behavior: Lehrman’s Hypotheses), page 99:
      The male [ring dove] will continue nest-coos for 3–4 days until his female partner begins to nest-coo. At that point the male's nest-coo begins to become less frequent [].
  2. (by extension) An expression of pleasure made by a person.
    • 2001, Denton L. Roberts; Caddy Roberts-Williams, “What You Need to Know to Be Useful”, in Living as Healer: (Everyone Does Therapy and Should … Know How), Pasadena, Calif.: Hope Publishing House, →ISBN, page 23:
      An infant has only cries and coos with which to communicate distress and well-being. Adults have many more ways of expressing themselves. However, their expressions of disease and ease can be boiled down to sophisticated cries and coos. A call for help in whatever form is a cry. A sense of well-being however expressed is a coo. Healing in the context of cries and coos can be viewed as the process of resolving the cries and fostering the coos.


coo (third-person singular simple present coos, present participle cooing, simple past and past participle cooed)

  1. (transitive, intransitive) To make a soft murmuring sound, as a pigeon.
  2. (intransitive) To speak in an admiring fashion, to be enthusiastic about.
    • 2013, Nicola Cornick, chapter 14, in One Night with the Laird (Harlequin HQN Historical Romance), Don Mills, Ont.: Harlequin HQN, →ISBN:
      They were too busy cooing over the baby and his parents were too busy cooing over each other.
Derived terms[edit]

Etymology 2[edit]

Clipping of cool; compare foo.


coo (comparative more coo, superlative most coo)

  1. (slang) Cool.

Etymology 3[edit]




  1. An expression of approval, fright, surprise, etc. [from early 20th c.]
    • 1960, P[elham] G[renville] Wodehouse, chapter VII, in Jeeves in the Offing, London: Herbert Jenkins, OCLC 1227855:
      I stood outside the door for a space, letting "I dare not" wait upon "I would", as Jeeves tells me cats do in adages, then turned the handle softly, pushed – also softly – and, carrying on into the interior, found myself confronted by a girl in housemaid's costume who put a hand to her throat like somebody in a play and leaped several inches in the direction of the ceiling. "Coo!" she said, having returned to terra firma and taken aboard a spot of breath. "You gave me a start, sir!" [] "If you cast an eye on him, you will see that he's asleep now." "Coo! So he is."
    • 1988 November, Sean Kelly, “Professional BMX Simulator [video game review]”, in Teresa Maughan, editor, Your Sinclair[2], number 35, London: Sportscene Specialist Press, ISSN 0269-6983, OCLC 877748737, archived from the original on 14 May 2016:
      The last track on each of the three sections is a professional course, where you can customise your bike by changing the tyres and the size of chainwheel. Coo!
    • 1989 November, “Competitions”, in Jim Douglas, editor, Sinclair User: The Independent Magazine for the Independent User[3], number 92, London: ECC Publications, ISSN 0262-5458, OCLC 225914690, archived from the original on 21 October 2013:
      We want you to come up with a side splitting caption for a picture drawn by the fair hand of those at System 3. If you turn out to be the Funniest "Person", we'll give you a big wopping model of a dinosaur. Coo.
    • 1990 April, “Crash Readers’ Awards Ceremony”, in Oliver Frey, editor, Crash: ZX Spectrum[4], number 75, [Ludlow, Shropshire]: Newsfield, ISSN 0954-8661, OCLC 500099432, archived from the original on 25 June 2017:
      Coo, I've only had four gallons of extra caffeine coffee today so I'm not my usual talking-to-PR-girlies-for-hours-on-end self. But bear with me a mo while I get myself together (audience waits for an age while he searches through his coat for the golden envelope). Here it is! Coo, and the winner is The NewZealand Story.





From Old Irish (dog, hound), from Primitive Irish ᚉᚒᚅᚐ (cuna, genitive), from Proto-Celtic *kū, from Proto-Indo-European *ḱwṓ (dog).


coo m (genitive singular coo, plural coyin)

  1. dog
  2. hound
  3. cur
  4. wolf dog


Derived terms[edit]


Manx mutation
Radical Lenition Eclipsis
coo choo goo
Note: Some of these forms may be hypothetical. Not every
possible mutated form of every word actually occurs.





  1. first-person singular present indicative of coar


Alternative forms[edit]


From Old English , from Proto-Germanic *kūz, from Proto-Indo-European *gʷṓws (cow).



coo (plural kye or coos)

  1. cow

Usage notes[edit]

The regular collective plural form is kye (from Old English); the weak plural coos is used only after numerals.