This is the 13986th most frequent Turkish word.
merdivenlerin
"The stairs'" (possessive form, meaning "of the stairs").
In this sentence, 'merdivenlerin' is the possessive form meaning 'of the stairs' and indicates the owner of the color being discussed.
Merdivenlerin rengi kırmızıya boyandı.
The color of the stairs has been painted red.
Here, 'merdivenlerin' again denotes possession, meaning 'beside the stairs,' showing the location relative to the stairs.
Merdivenlerin yanında bir bahçe var.
There is a garden beside the stairs.
In this example, 'merdivenlerin' has a possessive use, referring to 'of the stairs,' i.e., identifying the object that was fixed.