um Definition in Cambridge British English Dictionary
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Definition of "um" - British English Dictionary

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umexclamation

uk   us   /əm/
used in writing to represent the sound that people make when they are pausing or deciding what to say next: "What do you think of this jacket?" "Um, I don't know if I like the colour." "So what did you talk about?" "Um, I don't remember."
(Definition of um from the Cambridge Advanced Learners Dictionary & Thesaurus © Cambridge University Press)
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