coo

Universal Words verb, exclamation verb (cooing, cooed, cooed) 1 [V] when a DOVE or a PIGEON coos, it makes a soft low sound 2 [V, Vspeech] to say sth in a soft quiet voice, especially to sb you love IDIOMS see BILLv. coo noun exclamation (BrE, informal) used to show that you are surprised: Coo, look at him!