neuriën angolul

croon [crooned, crooning, croons]▼(to hum or sing softly or in a sentimental manner)
verb
[UK: kruːn] [US: ˈkruːn]

hum [hummed, humming, hums]▼(to make sound with lips closed)
verb
[UK: hʌm] [US: ˈhəm]