Tsk is a sound made by quickly releasing the tongue from the top of the mouth to express disapproval or criticism.
An example of tsk is the sound a mother would make while shaking her finger at a child who's done something wrong.
Used to express disappointment or sympathy.
(intransitive) To make a tsk sound of disapproval.
A sucking noise made by suddenly releasing the tongue from the hard palate, used to express disappointment or sympathy.
(a sound) Used to express disapproval, genuine or mock sympathy, etc.: a click, or sucking sound, made by touching the tongue to the hard palate and rapidly withdrawing it.
To utter this sound.