This is the 2967th most frequent Turkish word.
tüneli
"Tüneli" means "the tunnel" in English.
Here, 'tüneli' serves as the definite direct object of the verb 'geçmek' (to pass), referring to a specific tunnel.
Aracımız uzun tüneli hızla geçti.
Our vehicle quickly passed through the long tunnel.
The word 'tüneli' in this sentence is again a definite direct object, indicating a particular tunnel that is intended to be seen.
Tüneli görmek için dağa tırmandık.
We climbed the mountain to see the tunnel.
In this context, 'tüneli' appears as a specific noun, modified by the adjective 'karanlık' (dark), reinforcing its role as a definite noun in Turkish.