um Definition in the Cambridge English Dictionary
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Definition of “um” - English Dictionary

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umexclamation

 us   /ˈʌm, əm/
uh
(Definition of um from the Cambridge Academic Content Dictionary © Cambridge University Press)

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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