interjection

um

um, erm

Um, I'm not sure what to say.

Um, I'm not sure what to say.

Let me think... um... about five o'clock.

Let me think... um... about five o'clock.

Used at the start or in the middle of a sentence to show hesitation. Um, can I ask a question?

Synonyms: uh, er, well

Onomatopoeic, imitating the sound of a closed-mouth hesitation.

It's the sound you make with your mouth closed ('mmm') while you're thinking ('uh').

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