This is the 12327th most frequent Turkish word.
hatlardaki
"Hatlardaki" means "in/on the lines" or "on the routes" in English.
In this sentence, 'hatlardaki' means 'in the lines' (referring to telephone lines), describing the possessive connection to the issue.
Telefon hatlarındaki arıza hala çözülmedi.
The malfunction in the telephone lines is still not resolved.
Here, 'hatlardaki' refers to 'on the lines,' emphasizing the location of the writings, such as lines on a piece of paper.
Hatlardaki yazılar çok ilgi çekiciydi.
The writings on the lines were very interesting.
In this example, 'hatlardaki' indicates 'in the electrical lines,' pointing to the source of the problem being the lines.