Is it cold in here? ここ寒くない？

Definition

to give someone the cold shoulder: to intentionally be unfriendly or ignore someone you know

to give someone the cold shoulder: 冷たい態度をとる、愛想がない、無視する

Example

After I got the promotion, a few of my co-workers started giving me the cold shoulder.

昇進してから、同僚の何人かが私に冷たくなったの。