interjection

1. Indicating thinking or pondering.

   “Hmm... I just can't decide between the two.”

2. A demand for an answer to a question.

   “Just where were you until 2 a.m.? Hmm?”

Synonyms: hnn

noun

1. A hummed tune, i.e. created orally with lips closed.

2. An often indistinct sound resembling human humming.

   “They could hear a hum coming from the kitchen, and found the dishwasher on.”

3. Busy activity, like the buzz of a beehive.

verb

1. 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.”

2. To express by humming.

   “The team ominously hummed “We shall overcome” as they came back onto the field after the break.”

3. To drone like certain insects naturally do in motion, or sounding similarly

Synonyms: bumble, bustle, buzz, croon, hustle, whir

interjection

1. An expression used to show contentment for something

   “Mmm, this is a tasty pie!”

2. An expression used to show thought or reflection

   “Mmm, I see what you mean.”

3. An expression used to show being muffled or not able to speak clearly, as well as "mmph".

interjection

1. Expression of hesitation, uncertainty or space filler in conversation. See uh.

   “Let’s see... um... how about this?”