Learn Turkish: Özrünü kabul ettim. - I accepted his apology.

The root word is özür (apology). However, Turkish has a rule called vowel drop for certain words. When you add a suffix starting with a vowel to özür, the second vowel drops out. So özür becomes özr-, making the word easier to pronounce smoothly.

What do the suffixes on özrünü mean?

It has three parts after the root özr-. First is -ü, which is the possessive suffix meaning "his" (from the hidden word onun). Next is -n-, which is a buffer letter used when adding a case suffix to a third-person possessive. Finally, the last -ü is the accusative case suffix, which marks the apology as the direct object of the verb.

Could özrünü also mean "your apology"?

Yes, it could! Without a pronoun like onun (his/her) or senin (your) at the start of the sentence, the word özrünü looks exactly the same for both. It can be formed from özrün (your apology) + -ü (accusative) just as easily as özrü (his apology) + -n- (buffer) + -ü (accusative). You have to rely on context to know whose apology it is.

Why does the verb use two words (kabul ettim)?