This is the 1154th most frequent Spanish word.
encontrarse
"Encontrarse" means "to find oneself," "to be situated," or "to meet."
Here, 'encontrarse' is being used reflexively to indicate an encounter with someone.
Me encontré con María en el parque.
I met María at the park.
In this instance, 'encontrarse' describes a state or condition of being for the subject.
Juan se encuentra enfermo hoy.
Juan is feeling sick today.
'Encontrarse' here signifies unexpectedly encountering or discovering something.