a dirty look
A look of contempt, anger, or disgust. I got a really dirty look from the man sitting next to me when I started talking about politics. Do you know why Gina keeps giving me dirty looks? Is she mad at me?
Farlex Dictionary of Idioms. © 2015 Farlex, Inc, all rights reserved.
a dirty lookor
a filthy lookor
a black look
If someone gives you a dirty look, a filthy look, or a black look, they look at you in a way that shows that they are very angry about something. Tony was being a real pain. Michael gave him a dirty look and walked out of the kitchen. He caught the filthy look his daughter flashed him. Passing my stall, she cast black looks at the amount of stuff still unsold.
Collins COBUILD Idioms Dictionary, 3rd ed. © HarperCollins Publishers 2012