| Coo 1. (v. i.) To make a low repeated cry or sound, like the characteristic note of pigeons or doves. 2. (v. i.) To show affection; to act in a loving way. See under Bill. Thesaurus Entries aspirate, bark, bawl, bellow, blare, blat, blubber, boom, bray, breathe, buzz, cackle, call, carol, caw, chant, chatter, cheep, chirk, chirp, chirr, chirrup, chitter, chuck, clack, cluck, cock-a-doodle-doo, croak, cronk, crow, cuckoo, drawl, drum, exclaim, flute, gabble, gaggle, gasp, gobble, growl, grunt, guggle, hiss, honk, hoo, hoot, keen, lilt, maffle, mumble, murmur, mussitate, mutter, pant, peep, pip, pipe, quack, roar, roll, rumble, scold, scream, screech, shriek, sibilate, sigh, sing, snap, snarl, snort, sob, squall, squawk, squeal, susurrate, thunder, trill, trumpet, twang, tweet, twit, twitter, wail, warble, whine, whisper, whistle, yap, yawp, yell, yelp | ![]() |