Give someone the cold shoulder

Meaning

To intentionally ignore or act unfriendly toward someone. It is a social slight used to signal disapproval or a falling out.

Cool, icy

Used in a sentence

• I think she is mad at me because she has been giving me the cold shoulder all day.
• He gave me the cold shoulder during the meeting for no apparent reason.
• After their argument, she gave him the cold shoulder for a week.