This is the 3164th most frequent Turkish word.
düz
Flat; straight; smooth.
Here, 'düz' refers to the physical flatness or evenness of the road.
Bu yol çok düz.
This road is very flat.
In this sentence, 'düz' is used to describe making the hair straight or smooth.
Saçlarını düz yapmak istiyor.
She wants to straighten her hair.
Here, 'düz' indicates plainness or simplicity, without designs or patterns.