This is the 5252nd most frequent Turkish word.
kalmasını
"Kalmasını" means "remaining" or "staying" in English, often used in the context of someone or something staying/remaining.
The word 'kalmasını' here is used to express the desire for the book to remain (stay).
Bu kitabın rafta kalmasını istiyorum.
I want this book to remain on the shelf.
In this sentence, 'kalmasını' indicates the action of remaining in a specific place as an advice.
Misafirin projeyi bitirene kadar burada kalmasını öneririm.
I suggest that the guest remains here until finishing the project.
Here, 'kalmasını' is used metaphorically to describe the retention of the incident in one's mind.