Humming
[n] the act of singing with closed lips
[n] a humming noise; "the hum of distant traffic"
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bel canto, birring, bombilation, bombinating, bombination, booming, bravura, burring, busy, buzzing, choral singing, coloratura, croon, crooning, droning, folk singing, fussy, hopping, hum, hustling, intonation, lively, low rumbling, lyricism, operatic si