📖 WordNook

hum

noun
  1. a humming noise
    “the hum of distant traffic”
    humming
  2. the state of being or appearing to be actively engaged in an activity
    busyness
verb
  1. sing with closed lips
    “The chorus hummed a melody.”
  2. make a low continuous sound
    “The refrigerator is humming”
  3. sound with a monotonous hum
    thrum
  4. be noisy with activity
    buzz