This is the 9749th most frequent Turkish word.
arkasını
"Arkasını" means "its/his/her back" or "the back of it/him/her" in English.
used as 'arkasını', meaning 'his/her back', referring to a direction or physical part of someone's body.
Arkadaşımız arkasıyı dönüp gitti.
Our friend turned his back and left.
used as 'arkası', meaning 'the back side' of an object, specifically the book in this context.
Kitabın arkası çok ilginç bilgiler içeriyor.
The back side of the book contains very interesting information.
used as 'arkasını', meaning 'the back side' of a place, specifically the house in this context.