Meaning of ER in English

ER

transcription, транскрипция: [ ɜ:(r) ]

Er is used in writing to represent the sound that people make when they hesitate, especially while they decide what to say next.

I would challenge the, er, suggestion that we’re in third place...

Collins COBUILD Advanced Learner's English Dictionary.      Английский словарь Коллинз COBUILD для изучающих язык на продвинутом уровне.