This is the 2324th most frequent Turkish word.
duvarı
"Duvarı" means "the wall" in English (accusative case).
In this sentence, 'duvarı' (the wall) functions as the definite object of possession, specifically referring to the wall that belongs to 'odamın' (my room).
Odamın duvarı mavi renkte boyalıdır.
The wall of my room is painted in blue.
Here, 'duvarı' (the wall) takes the role of a direct object that is affected by the action of 'çizmek' (to draw).
Kalemle duvarı çizmemelisiniz.
You shouldn't draw on the wall with a pen.
In this example, 'duvarını' (the wall) signifies the wall of the garden as the object of an action, with the suffix '-ını' adding specificity.