coo1

 
Pronunciation: /kuː/

verb (coos, cooing, cooed)

[no object]
  • (of a pigeon or dove) make a soft murmuring sound: ringdoves cooed among the branches
  • (of a person) speak in a soft gentle voice: she cooed with delight as he unpacked the bags [with direct speech]: ‘I knew I could count on you,’ she cooed

noun

  • a soft murmuring sound made by a dove or pigeon: the coo of the dove

Origin:

mid 17th century: imitative