to get scared, to become frightened
La señorita Rosinha podría asustarse.
Miss Rosinha might get scared.
— O Auto da Compadecida (2000)
No hay nada de qué asustarse.
There's nothing to be afraid of.
Tom es demasiado estúpido para asustarse.
Tom is too stupid to be scared.
Asustarse, asustarse.
To get scared, to get scared.
— The Running Man (2025)
No hay razón para asustarse.
There’s no reason to be scared.
— Las noches de Cabiria (1957)