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| hum [ hum ] |
verb (past and past participle hummed, present participle hum·ming, 3rd person present singular hums) |
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| Definition: |
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1. transitive and intransitive verb sing with lips closed: to sing with lips closed and without words, or sing something in this way
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2. intransitive verb make droning sound: to make a steady prolonged droning sound
  bees humming
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3. intransitive verb give off low indistinct noise: to be filled with a low, continuous, indistinct noise
a room that hummed with strange electronic equipment
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4. intransitive verb be extremely busy: to be very busy or active
(
informal
)
This place is really humming.
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noun |
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| Definition: |
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droning noise: a steady droning sound
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interjection |
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| Definition: |
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expression of displeasure or indecision: a low sound made to express displeasure, doubt, surprise, or indecision
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| [14th century. An imitation of the sound] |
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| hum·ma·ble adjective |
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