This is the 3035th most frequent Turkish word.
açar
The Turkish word "açar" means "opens" (third person singular present tense of "açmak").
Here, 'açar' means 'opens', referring to physically opening the curtains.
Sabahları erken kalkar ve perdeleri açar.
In the mornings, he/she wakes up early and opens the curtains.
In this sentence, 'açar' is used metaphorically to mean 'opens up' in a figurative sense regarding opportunities or understanding.
Bu kitap sana yeni ufuklar açar.
This book opens up new horizons for you.
Again, 'açar' is used figuratively to suggest expanding knowledge or perspective.