turn your nose up (at something)
From Longman Dictionary of Contemporary Englishturn your nose up (at something)turn your nose up (at something)informalREJECT/NOT ACCEPT to refuse to accept something because you do not think it is good enough for you My children turn their noses up at home cooking. → noseExamples from the Corpusturn your nose up (at something)• Many professors turn their noses up at television.