a‧pol‧o‧gize S2 (also apologise British English) /əˈpɒlədʒaɪz $ əˈpɑː-/ verb [intransitive]
to tell someone that you are sorry that you have done something wrong ⇒ apologetic:
I’m so sorry, I do apologize.
apologize to
I think you should apologize to your brother.
apologize for (doing) something
He later apologized for his behaviour.
I apologize for losing my temper.

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In everyday English, people often use the phrases say (you are) sorry or tell someone you are sorry, rather than apologize (to somebody):
■ I've already apologized to him. ➔ I’ve already told him I'm sorry.

[TahlilGaran] Dictionary of Contemporary English ▲