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English definition of “coo”

coo

verb [I]     /kuː/ (present participle cooing, past tense and past participle cooed)
When birds such as doves and pigeons coo, they make a low soft sound.Animal (non-human) sounds to speak in a soft, gentle, or loving way: The baby lay in his cot, cooing and gurgling. It's sickening the way she coos over those cats of hers. [+ speech] "How wonderful to see you again, darling," she cooed.Ways of talking
(Definition of coo verb from the Cambridge Advanced Learner's Dictionary & Thesaurus © Cambridge University Press)
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