Definition of "coo" [coo]

• To utter the murmuring sound of a dove or pigeon or a sound resembling it. (verb-intransitive)
• To talk fondly or amorously in murmurs: The visitors cooed over the newborn baby. (verb-intransitive)
• To express or utter with soft murmuring sounds. (verb-transitive)

American Heritage(R) Dictionary of the English Language, Fifth Edition. Copyright (c) 2011 by Houghton Mifflin Harcourt Publishing Company. Published by Houghton Mifflin Harcourt Publishing Company. All rights reserved.

• "I don't b'Iieve he's anywhere within coo-ee of our place."
• "An interpretation might go like this: The a coo akab (mad one of the night, i.e. the screech owl) above the 13th heaven is perched upon the shoulders of Colel (another name for Ixchel)."
• "Carl Kay, of Tokyo, wrote, “When a long-sullen baby suddenly expresses contentment in response to the exaggerated gestures of an adult, it is called a coo de théâtre.”"