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English definition of “coo”

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coo

verb [I]  /ku/ ( present tense coos, present participle cooing, past tense and past participle cooed) us  
(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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