ER
Meaning of ER in English
transcription, транскрипция: [ ˈə, ˈä, usually with prolonged vowel, ]
÷ˈər interjection
Date: 1862
— used to express hesitation
Merriam-Webster's Collegiate English vocabulary.
Энциклопедический словарь английского языка Merriam Webster.
2003