umm
interj. A1 Beginner US //ˈəm// umm
interj. a sound you make when you are thinking or hesitating before speaking. It shows you need a moment to find the right words.
interj. a vocalized pause indicating hesitation, uncertainty, or the search for words. Typically occurs at the beginning of an utterance or between clauses.
Umm, I am not sure about that.
She paused for a moment, saying 'umm' before answering the difficult question.
The politician's frequent use of 'umm' during the debate undermined his projected authority and suggested a lack of preparation.