This is the 351st most frequent Azerbaijani word.
dərin
"Deep"
In this sentence, "dərin" is used as an adjective to describe the physical depth of the sea.
Dəniz çox dərin olduğu üçün orada üzmək təhlükəlidir.
The sea is very deep, so swimming there is dangerous.
Here, "dərin" metaphorically describes the profound and thoughtful nature of the ideas in his books.
Onun kitablari dərin düşüncələr ilə doludur.
His books are filled with deep thoughts.
In this usage, "dərin" illustrates the depth of time, emphasizing the late hours of the night.