This is the 3130th most frequent Turkish word.
der
"Der" means "says" or "states" in English.
Here, 'der' conveys the act of saying, specifically stating something in the 3rd person singular present of the verb 'demek'.
Bu kitap çok değerlidir, annem der.
This book is very valuable, my mom says.
In this context, 'der' means to tell or narrate, indicating communication from one individual to another in the 3rd person singular present form.
Her derdini bana der.
She tells all her troubles to me.
Within this sentence, while retaining the meaning of expressing or stating, 'der' implies an ongoing action in a scholarly or attentive manner, in the 3rd person singular present tense of 'demek'.