brommen (ww):
summen(en) to make sound with lips closed.
(en) to drone like certain insects naturally do in motion.
(fr) Émettre un ronflement., Zähne fletschen(en) To growl., eintönig sprechen(en) to speak in a monotone way., grummeln(fr) Grommeler., knurren(en) To growl., leiern(en) to speak in a monotone way., murmeln(fr) Murmurer sourdement., nuscheln(fr) Murmurer sourdement., surren(en) To move or vibrate (something) with a buzzing sound.
brommen (zn):
Brummen(en) a low-pitched hum or buzz., Dröhnen(en) a low-pitched hum or buzz.
Via: Dbnary en WikiWoordenboeken
Via: Memodata.com