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 hum or sing softly.

verb-intransitive. To sing popular songs in a soft, sentimental manner.

verb-intransitive. Scots To roar or bellow.

v. To sing softly or in a humming way: crooning a lullaby.

n. A soft singing or humming.

v. To hum or sing softly or in a sentimental manner.

n. A soft or sentimental hum or song.

verb-intransitive. To make a continuous hollow moan, as cattle do when in pain.

verb-intransitive. To hum or sing in a low tone; to murmur softly.

verb-intransitive. To sing in a soft, evenly modulated manner adapted to amplifying systems, especially to sing in such a way with exaggerated sentimentality.

v. To sing in a low tone, as if to one's self; to hum.

v. To soothe by singing softly.

n. A low, continued moan; a murmur.

n. A low singing; a plain, artless melody.

To utter a low continued murmuring sound resembling moaning or lamenting.

To sing softly and monotonously to one's self; hum softly and plaintively.

To utter a low muffled roar; bellow monotonously.

To sing in a low humming tone; hum; affect by humming.

n. A low, hollow moan or bellow.

v. sing softly

"Morrissey's heartsick legato croon is reassigned to four women and two men, who deliver anything from keening, primal unaccompanied wails to swing-era harmonies."

crooned    crooning    croons   

sing   

crooned    crooning    crooner   

hum    murmur   

Bethune    Boone    Calhoun    June    Karun    Kuhn    Moon    Noone    Rangoon    Sassoon