This is the 9421st most frequent Turkish word.
acısının
"Of his/her/its pain" or "of the pain" (possessive form in Turkish).
In this sentence, 'acısının' refers to the pain ('acı') belonging to a wound ('yarasının'), using the possessive suffix for the third person singular.
Bu ilaç, yarasının acısının hafiflemesine yardımcı olur.
This medicine helps to alleviate the pain of their wound.
Here, 'acısının' is used to express someone's pain ('acı') specifically, indicating that the pain being felt deeply belongs to them.
Acısının çok derin olduğunu hissedebiliyorum.
I can feel that their pain is very deep.
The phrase 'acısının' denotes the pain ('acı') caused by their experiences, connecting it to the events ('yaşadıklarının') with possessive and genitive constructions.