Other forms: tuts; tutting; tutted
To tut is to express your feelings of irritation or displeasure. You might tut quietly at your friend's badly behaved dog.
Since the 1520s, tut and tut-tut have been used as interjections to express contempt or impatience; and to make such a disapproving sound is to tut. Your substitute teacher might say, "Tut, class, I'm not happy with all the noise you're making," and your piano teacher might tut a bit when you confess that you didn't practice at all this week.