coo Meaning in Cambridge American English Dictionary
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Meaning of "coo" - American English Dictionary

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cooverb [I]

 us   /ku/ (present tense coos, present participle cooing, past tense and past participle cooed)
(esp. of some birds, such as pigeons ) to make a low, soft call, or (of people) to speak in a soft, gentle way: My baby gazed back at me and cooed.
(Definition of coo from the Cambridge Academic Content Dictionary © Cambridge University Press)
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