This is the 5358th most frequent Turkish word.
kiraladıkları
"The ones they rented" or "what they rented."
In this sentence, 'kiraladıkları' means 'they rented' as a relative form, indicating the possession or action related to the car.
Kiraladıkları araba şehirde dolaşmak için çok uygundu.
The car they rented was very suitable for driving around the city.
Here, 'kiraladıkları' describes 'ev' (house), making it clear that it is the house they have rented.
Kiraladıkları evin manzarası çok güzeldi.
The view from the house they rented was very beautiful.
'Kiraladıkları' is used to describe 'bisikletler' (bicycles), showing the action of renting performed by the subject.