- 1[intransitive] when a dove 1or a pigeon coos, it makes a soft low sound
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- 2[intransitive, transitive] (+ speech) to say something in a soft quiet voice, especially to someone you love Idioms
coo
verbNAmE//ku//
Verb Forms present simple I / you / we / they coo he / she / it coos
past simple cooed
-ing form cooing
if two people who are in love bill and coo, they kiss and speak in a loving way to each other
See coo in the Oxford Advanced Learner's Dictionary
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