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English definition of “coo”

coo

verb [I] uk   /kuː/ (present participle cooing, past tense and past participle cooed) us  
When birds such as doves and pigeons coo, they make a low soft sound. 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.
(Definition of coo from the Cambridge Advanced Learners Dictionary & Thesaurus © Cambridge University Press)
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