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hum

From Wiktionary

Pronunciation

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Verb

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Plain form
hum

Third-person singular
hums

Past tense
hummed

Past participle
hummed

Present participle
humming

  1. (intransitive) To make a sound you can make in your throat with your mouth closed. Often, this is done to make music without singing words.
    I used to hum the music from the Indiana Jones movies when I was a child.
  2. (intransitive) A similar sound, such as one from a machine.
    The engine hummed as he started drove the car.

Noun

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Singular
hum

Plural
hums

  1. (countable) Hum is the sound of humming, or a sound like humming.
    I heard a low hum from the other room.