hum [hummed, humming, hums](to make sound with lips closed) verb [UK: hʌm] [US: ˈhəm]Stop humming. = Smettila di mormorare.
murmur [murmured, murmuring, murmurs](to speak or make low, indistinguishable noise; to mumble) verb [UK: ˈmɜː.mə(r)] [US: ˈmɝː.mər]The shy boy murmured his name. = Il ragazzo timido ha mormorato il suo nome.