exclamation
the way of writing the sound /ʌ/ or /ɜ:/ that people make when they are not sure about sth, when they do not hear or understand sth you have said, or when they want you to agree with what they have said :
Uh, yeah, I guess so.
'Are you ready yet?' 'Uh? Oh. Yes.'
We can discuss this another time, uh?
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WORD ORIGIN
1960s: imitative.