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

     

    coo

     verb
    verb
    BrE BrE//kuː//
     
    ; NAmE NAmE//kuː//
     
    Verb Forms present simple I / you / we / they coo
    BrE BrE//kuː//
     
    ; NAmE NAmE//kuː//
     
    he / she / it coos
    BrE BrE//kuːz//
     
    ; NAmE NAmE//kuːz//
     
    past simple cooed
    BrE BrE//kuːd//
     
    ; NAmE NAmE//kuːd//
     
    past participle cooed
    BrE BrE//kuːd//
     
    ; NAmE NAmE//kuːd//
     
    -ing form cooing
    BrE BrE//ˈkuːɪŋ//
     
    ; NAmE NAmE//ˈkuːɪŋ//
     
    Love
     
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  1. 1[intransitive] when a dove1 or a pigeon coos, it makes a soft low sound More Like This Animal sounds baa, caw, coo, meow, moo, neigh, oink, quack, tu-whit, tu- whoo, tweet, woofSee worksheet.
  2. 2[intransitive, transitive] (+ speech) to say something in a soft quiet voice, especially to somebody you love See related entries: Love
  3. Word Originverb and noun mid 17th cent.: imitative.Idioms (old-fashioned, informal) if two people who are in love bill and coo, they kiss and speak in a loving way to each other