hold a grudge
To stay angry (at someone or something).
That guy sure can hold a grudge when something goes wrong.
ADJ
long-standing, old
My parents finally resolved their long-standing grudge after many years of not speaking to each other.
personal
VERB + GRUDGE
bear, harbour, have, hold, nurse
She still harbours a grudge against her former business partner after the dispute.
PREP
~ against
My former colleague still holds a grudge against me for getting the promotion instead.