nurse a grudge
nurse a grudge {v. phr.}
To keep a feeling of envy or dislike toward some person; remember something bad that a person said or did to you, and dislike the person because of that.
Torn nursed a grudge against John because John took his place on the basketball team.
Mary nursed a grudge against her teacher because she thought she deserved a better grade in English.
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Source: A Dictionary of American Idioms
