This is the 11950th most frequent Turkish word.
giremediği
"That he/she/it could not enter."
In this sentence, 'giremediği' is used to describe the reason for not being able to enter the room, forming a dependent clause.
Alan çok dar olduğu için odaya giremediği söylendi.
It was said that he could not enter the room because the area was very narrow.
Here, 'giremediği' refers to the time when he was unable to enter the house, and it defines a specific situation.
Eve giremediği zaman kendini çok üzgün hissediyordu.
He felt very sad when he couldn't enter the house.
In this usage, 'giremediği' provides the cause for the action of looking for an alternative route.