Um, I’m not sure about that.
Used to express hesitation or uncertainty in speech.
Um, can you repeat that?
Um, I think I left my keys somewhere.
Um, what do you want to eat?
Um, let me think
Um, I guess
Um, hold on
Uh
Er
Ah
His speech was full of ums and ahs.
A sound made to indicate hesitation or thought.
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