This word is acceptable for play in the US & UK dictionaries that are being used in the following games:

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verb-intransitive. To utter the murmuring sound of a dove or pigeon or a sound resembling it.

verb-intransitive. To talk fondly or amorously in murmurs: The visitors cooed over the newborn baby.

v. To express or utter with soft murmuring sounds.

n. The murmuring sound made by a dove or pigeon.

v. To make a soft murmuring sound, as a pigeon.

v. To speak in an admiring fashion, to be enthusiastic about.

interjection. Expression of fright, surprise, approval, etc.

adj. cool

verb-intransitive. To make a low repeated cry or sound, like the characteristic note of pigeons or doves.

verb-intransitive. To show affection; to act in a loving way. See under Bill, v. i.

To utter a low, plaintive, murmuring sound (imitated by the sound of the word) characteristic of pigeons or doves.

Hence To converse affectionately, like cooing doves; make love in murmuring endearments: commonly in the phrase to bill and coo. See bill, v. i.

To utter by cooing.

To call.

n. The characteristic murmuring sound uttered by doves and pigeons.

n. the sound made by a pigeon

v. cry softly, as of pigeons

v. speak softly or lovingly

"I don't b'Iieve he's anywhere within coo-ee of our place."

cooed    cooing    coos   

cry    emit    let out    let loose    utter    murmur   

bill and coo   

Bill   

cooingly    cooer   

Baku    Blue    Cebu    Chengdu    Chou    Chu    Crewe    Drew    Ewe    Few   

cluck    nuzzle    kil    star-bespangled    whisk