This is the 210th most frequent Lithuanian word.
sau
"Sau" in Lithuanian means "to oneself" or "for oneself."
In this sentence, 'sau' is used reflexively to indicate that the action is done for oneself.
Aš pasiėmiau knygą sau.
I took a book for myself.
In this sentence, 'sau' is used reflexively, indicating an internal dialogue or action.
Pasakyk sau, kad tu tai gali.
Tell yourself that you can do it.
Here, 'sau' expresses that the singing is directed to oneself, denoting a form of internal action.