Meaning of ER in English

ER

/ ɜː(r); NAmE / (also erm ) exclamation

( BrE ) the sound that people make when they are deciding what to say next :

'Will you do it?' 'Er, yes, I suppose so.'

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WORD ORIGIN

natural utterance: first recorded in English in the mid 19th cent.

Oxford Advanced Learner's English Dictionary.      Оксфордский английский словарь для изучающик язык на продвинутом уровне.