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See also: COO



Etymology 1[edit]

Of onomatopoetic/imitative origin. Compare Dutch koeren.


coo (plural coos)

  1. The murmuring sound made by a dove or pigeon.


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

  1. (transitive or intransitive) To make a soft murmuring sound, as a pigeon.
    • 26 June 2014, A.A Dowd, AV Club Paul Rudd and Amy Poehler spoof rom-com clichés in They Came Together[1]
      As Norah Jones coos sweet nothings on the soundtrack, the happy couple—played by Paul Rudd and Amy Poehler—canoodle through a Manhattan montage, making pasta for two, swimming through a pile of autumn leaves, and horsing around at a fruit stand.
  2. (intransitive) To speak in an admiring fashion, to be enthusiastic about.
    • 2013, Nicola Cornick, One Night with the Laird (page 206)
      They were too busy cooing over the baby and his parents were too busy cooing over each other.
Derived terms[edit]
Related terms[edit]

Etymology 2[edit]

Shortening of cool. Compare foo.


coo (comparative more coo, superlative most coo)

  1. (slang) cool

Etymology 3[edit]

EB1911 - Volume 01 - Page 001 - 1.svg This entry lacks etymological information. If you are familiar with the origin of this term, please add it to the page per etymology instructions. You can also discuss it at the Etymology scriptorium.



  1. Expression of fright, surprise, approval, etc.
    • 1960, P. G. Wodehouse, Jeeves in the Offing, chapter VII:
      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, Sean Kelly, Professional BMX Simulator (video game review in Your Sinclair, issue 35, November 1988)
      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, Competitions (in Sinclair User, issue 92, November 1989)
      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, Crash readers' awards ceremony (in Crash, issue 75, April 1990)
      Mark: '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 New Zealand 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 cú” in Dictionary of the Irish Language, Royal Irish Academy, 1913–76.




  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.