\ ˈkü How to pronounce coo (audio) \
cooed; cooing; coos

Definition of coo

 (Entry 1 of 2)

intransitive verb

1 : to make the low soft cry of a dove or pigeon or a similar sound The baby cooed quietly in her crib.
2 : to talk fondly, amorously, or appreciatively The family cooed over the baby pictures.

Definition of COO (Entry 2 of 2)

chief operating officer

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Other Words from coo


coo noun

Examples of coo in a Sentence

Verb The baby cooed quietly in her crib. The baby was making a cooing sound. They all cooed over the baby pictures. “Oh, how sweet,” she cooed.
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Recent Examples on the Web: Verb Selvi was more interested in her caregiver than the strangers cooing at her through a screen 8,000 miles away. Maria Abi-habib, New York Times, "An Adoption, a Pandemic and an Evacuation," 6 May 2020 Selena Gomez coos about self-care over music that inspires only slight sashays. Spencer Kornhaber, The Atlantic, "Pop Music’s Version of Life Doesn’t Exist Anymore," 19 Mar. 2020 So, rather than coo to their 6-month-old grandson in his highchair, Colleen and Mark Shere will wave at him through a window. Holly V. Hays, Indianapolis Star, "How families gather for Passover seder amid COVID-19 outbreak," 7 Apr. 2020 On Instagram, getting his hair cornrowed, letting his goofball flag fly and cooing with his family for Christmas. Kurt Streeter, New York Times, "The Unbearable Lightness of Being Russell Wilson," 4 Jan. 2020 The telling varies, but the conclusion doesn’t: ZaNiyah, Duckett coos, is a real miracle. Hannah Natanson, Washington Post, "On Christmas Eve, D.C. firefighters meet the baby they saved," 24 Dec. 2019 On YouTube, a series of unboxing videos had materialized, with people cooing over new pink princesses like newborn babies. Arielle Pardes, Wired, "The Princess, the Plantfluencers, and the Pink Congo Scam," 19 Feb. 2020 Around him, eager fans and spectators shuffled by shoulder-to-shoulder as though queuing up for a celebrity sighting, camera phones outstretched, cooing over the collective din. Video Player is loading. Raisa Bruner, Time, "'He Looks Into Your Soul When He Looks At You.' Meet Bono the Havanese, the Westminster Dog Show's Most Diminutive Rock Star With the 'It Factor' to Go the Distance," 12 Feb. 2020 Employers wonder: Will coworkers get any work done with babies crying and cooing all the time? Katie Johnston,, "More employers are offering parents a chance to bring their babies to work," 19 Jan. 2020

These example sentences are selected automatically from various online news sources to reflect current usage of the word 'coo.' Views expressed in the examples do not represent the opinion of Merriam-Webster or its editors. Send us feedback.

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First Known Use of coo


1577, in the meaning defined at sense 1

History and Etymology for coo



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Cite this Entry

“Coo.” Dictionary, Merriam-Webster, Accessed 10 Aug. 2020.

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How to pronounce COO (audio)

English Language Learners Definition of coo

: to make the soft sound of a dove or pigeon also : to make a similar sound
: to talk in a soft, quiet, and loving way


\ ˈkü How to pronounce coo (audio) \
cooed; cooing

Kids Definition of coo

 (Entry 1 of 2)

1 : to make the soft sound made by doves and pigeons or a similar sound
2 : to talk or say fondly or lovingly “Hush now,” she cooed to her baby.


plural coos

Kids Definition of coo (Entry 2 of 2)

: a sound of or similar to that made by doves and pigeons

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More from Merriam-Webster on coo

Thesaurus: All synonyms and antonyms for coo

Rhyming Dictionary: Words that rhyme with coo

Spanish Central: Translation of coo

Nglish: Translation of coo for Spanish Speakers

Britannica English: Translation of coo for Arabic Speakers

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