interjection \a sound made with the organs of speech in position for m, a voiced beginning which usually has the heaviest stress, and a voiced ending separated by an h-like period of voicelessness\

Definition of um–hum

  1. —used to express affirmation, agreement, comprehension, or interest

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Origin and Etymology of um–hum

origin unknown

Seen and Heard

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a trip made at another's expense

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