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hum verb

  /ˈhʌm/
  • (intransitive) To make a sound from the vocal cords without pronouncing any real words, with one's lips closed.
 summen

hum noun

  /ˈhʌm/
  • A hummed tune, i.e. created orally with lips closed.
 Summen

humming

Gebrumm
ho-hum
langweilig
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