This is the 396th most frequent Croatian word.
nastupa
"Performances" or "appearances" (depending on context).
Here, 'nastupa' is used as a verb meaning 'performs', indicating an action the subject (the music band) is undertaking.
Glazbena grupa nastupa večeras u dvorani.
The music band performs tonight in the hall.
Here, 'nastupa' is used as a verb meaning 'ensues' or 'begins', describing the start of a situation (cold weather).
S prvim znakom zime, hladno vrijeme nastupa.
With the first sign of winter, cold weather ensues.
Here, 'nastupa' is used as a noun meaning 'demeanor' or 'approach', referring to someone's behavior or manner.