UK:*UK and possibly other pronunciationsUK and possibly other pronunciations/əˈpɒlədʒaɪz/US:USA pronunciation: IPA and respellingUSA pronuncation: IPA/əˈpɑləˌdʒaɪz/ ,USA pronunciation: respelling(ə polə jīz′)

Inflections of 'apologize' (v): (⇒ conjugate)
v 3rd person singular (US & UK)
v pres pverb, present participle: -ing verb used descriptively or to form progressive verb--for example, "a singing bird," "It is singing." (US & UK)
v pastverb, past simple: Past tense--for example, "He saw the man." "She laughed." (US & UK)
v past pverb, past participle: Verb form used descriptively or to form verbs--for example, "the locked door," "The door has been locked." (US & UK)
WordReference Collins English Usage © 2020
If you apologize to someone, you say you are sorry.
Afterwards George apologized to him personally.
Be careful
Apologize must be followed by to in sentences like these. Don't say, for example, ‘George apologized him’.
If you apologize for something you have done, or apologize for something someone else has done, you say you are sorry about it.
Later, Brad apologized to Simon for his rudeness.
‘I apologize’ and ‘I’m sorry'
If you are sorry for something you have done, you can say I apologize. This is a formal use. In informal conversation, you are more likely to say I'm sorry or Sorry.
I apologize for being late.
Sorry I'm late.
'apologize' also found in these entries:

Report an inappropriate ad.