This is the 9576th most frequent Turkish word.
altındalar
"They are under (it)."
The word 'altındalar' indicates the location of the books relative to the table, conveying that they are underneath it.
Kitaplar masanın altındalar.
The books are under the table.
Here, 'altındalar' refers to the positional context of shadows being located beneath the building.
Gölgeler binanın altındalar.
The shadows are underneath the building.
In this sentence, 'altındalar' shows the spatial relationship of the toys being directly under the umbrella.