\ 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 Our favorite amphibians kiss and coo over their baby. Lauren Morgan,, "The Mandalorian recap: Mando meets a legendary Mandalorian warrior," 13 Nov. 2020 The high point of the celebration always was a new baby to coo over. Vincent T. Davis,, "San Antonio beautician proud of her family legacy," 28 Sep. 2020 Mering and Heidecker coo the tune, like parents singing a baby to sleep. Washington Post, "Tim Heidecker found fame through absurdist humor. His new album ‘Fear of Death’ is no laughing matter.," 25 Sep. 2020 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

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 18 May. 2021.

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More Definitions for coo



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

More from Merriam-Webster on coo

Thesaurus: All synonyms and antonyms for coo

Nglish: Translation of coo for Spanish Speakers

Britannica English: Translation of coo for Arabic Speakers

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