coo

1 [koo]
verb (used without object), cooed, cooing.
1.
to utter or imitate the soft, murmuring sound characteristic of doves.
2.
to murmur or talk fondly or amorously.
verb (used with object), cooed, cooing.
3.
to utter by cooing.
noun
4.
a cooing sound.

Origin:
1660–70; imitative

cooer, noun
cooingly, adverb
Dictionary.com Unabridged

coo

2 [koo]
interjection British Slang.
(used to express surprise or amazement.)

Origin:
1910–15; origin uncertain

Coo

[kaw-aw]
noun
Italian name of Kos.

COO

chief operating officer.
Dictionary.com Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2014.
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Collins
World English Dictionary
coo (kuː)
 
vb , coos, cooing, cooed
1.  (intr) (of doves, pigeons, etc) to make a characteristic soft throaty call
2.  (tr) to speak in a soft murmur
3.  (intr) to murmur lovingly (esp in the phrase bill and coo)
 
n
4.  the sound of cooing
 
interj
5.  slang (Brit) an exclamation of surprise, awe, etc
 
'cooer
 
n
 
'cooingly
 
adv

CoO
 
abbreviation for
cost of ownership

COO
 
abbreviation for
chief operating officer

Collins English Dictionary - Complete & Unabridged 10th Edition
2009 © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins
Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009
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Etymonline
Word Origin & History

coo
1670, echoic; the phrase to bill and coo is first recorded 1816. Related: Cooing (1660s).
Online Etymology Dictionary, © 2010 Douglas Harper
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American Heritage
Abbreviations & Acronyms
COO
chief operating officer
The American Heritage® Abbreviations Dictionary, Third Edition
Copyright © 2005 by Houghton Mifflin Company.
Published by Houghton Mifflin Company. All rights reserved.
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Example sentences
The red-faced monkeys frequently utter what researchers have dubbed coo calls
  to maintain vocal contact with one another.
When they leave, he shoots a furtive glance to either side, then moves in to
  coo for himself.
They hold hands, rub knees, sit in the last row of the movies so they can kiss
  and coo.
As the sun rose, their collective coo grew louder and louder as more of them
  joined the chorus.
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