What is the meaning of Turn_up_one's_nose?

To make the gesture of raising one's nose, as a sign of scorn, contempt or disgust.

To regard with contempt or scorn; to treat with contempt or scorn; to ignore or disregard in a contemptuous or scornful way.

To refuse, especially with disgust, contempt or scorn; to refuse with apparent disregard about offending the offerer.