The word "hmm" is an expression that people use when they are thinking, unsure, or contemplating something. It is often used to show hesitation or uncertainty.
Sentences with «hmm»
Hmm good question, I do wonder if the tv has something to do with it. (nintendotoday.com)
Hmm maybe i'll pull out the batch from the freezer. (iheartnaptime.net)
Hmm what do you mean by, «digital download»? (zhugeex.com)