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English definition of “um”

um

exclamation uk   /əm/ us  
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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