silent treatment
noun
Britannica Dictionary definition of SILENT TREATMENT
the silent treatment
:
the act of ignoring someone because you are angry at him or her
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I told him that I thought he was crazy and got the silent treatment for the rest of the day. [=he refused to talk to me for the rest of the day]
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Whenever she gets mad at me, she gives me the silent treatment. [=she does not speak to me]