This is the 13400th most frequent Turkish word.
koltuğuna
"To his/her/its armchair" or "to his/her/its seat."
In this sentence, 'koltuğuna' indicates possession and location, meaning 'on his chair', showing that the chair belongs to Ali and where the object is being placed.
Ali yeni aldığı kitabı koltuğuna koydu.
Ali placed the book he recently bought on his armchair.
Here, 'koltuğuna' similarly denotes possession and location ('on her chair'), and it specifies the destination of the action.
Fatma, misafiri için koltuğuna geçen haftadan bir battaniye koymuş.
Fatma had placed a blanket on her armchair for her guest last week.
In this context, 'koltuğuna' means 'on his chair', demonstrating its use for destination in physical movement.