Definition of coo noun from the Oxford Advanced Learner's Dictionary



    BrE BrE//kuː//
    ; NAmE NAmE//kuː//
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  1. 1the soft, low sound made by a dove or a pigeon
  2. 2words or sounds spoken in a soft, quiet voice, especially to somebody you love Repeating back coos from the baby helps the infant to understand the nature of language.