turn nose up at
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turn (one's) nose up at (someone or something)
To reject someone or something with disdain (which can be accompanied by literally putting one's nose in the air). Naturally, my cat keeps turning up his nose at the expensive food I bought for him.
turn one's nose up at someone or something
1. Lit. to raise one's head and therefore one's nose slightly as a sign of rejection. I never turn my nose up at food. I never turn up my nose at dessert, no matter what it is.
2. Fig. to sneer at someone or something; to reject someone or something. John turned his nose up at Ann, and that hurt her feelings. He turned up his nose.