turn up one's nose

(v) : (idiomatic, with "at") To regard with contempt or scorn; to treat with contempt or scorn; to ignore or disregard in a contemptuous or scornful way.

(v) : (idiomatic, with "at") To refuse, especially with disgust, contempt or scorn; to refuse with apparent disregard about offending the offerer.

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