Definition of "um"
preposition:
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Alternative form of umbe.
from Wiktionary, Creative Commons Attribution/Share-Alike License
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interjection:
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Expression of confusion or space filler in conversation.
from Wiktionary, Creative Commons Attribution/Share-Alike License
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verb:
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To make the um sound to express confusion or hesitancy.
from Wiktionary, Creative Commons Attribution/Share-Alike License
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