HUM
Definition of HUM
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Indicating thinking or pondering.
"Hmm... I just can't decide between the two."
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A demand for an answer to a question.
"Just where were you until 2 a.m.? Hmm?"
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A hummed tune, i.e. created orally with lips closed.
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An often indistinct sound resembling human humming.
"They could hear a hum coming from the kitchen, and found the dishwasher on."
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Busy activity, like the buzz of a beehive.
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To make a sound from the vocal chords without pronouncing any real words, with one's lips closed.
"We are humming happily along with the music."
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To express by humming.
"The team ominously hummed “We shall overcome” as they came back onto the field after the break."
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To drone like certain insects naturally do in motion, or sounding similarly
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An expression used to show contentment for something
"Mmm, this is a tasty pie!"
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An expression used to show thought or reflection
"Mmm, I see what you mean."
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An expression used to show being muffled or not able to speak clearly, as well as "mmph".
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Expression of hesitation, uncertainty or space filler in conversation. See uh.
"Let’s see... um... how about this?"
Source: Wiktionary