This is the 2279th most frequent Spanish word.
pasaron
"Pasaron" means "they passed" or "they happened" in English.
Here, 'pasaron' is used to indicate the action of passing by a location.
Ellos pasaron frente a la tienda sin entrar.
They passed by the store without entering.
In this usage, 'pasaron' expresses the action of something occurring internally, such as thoughts crossing the mind.
Durante la charla, muchas cosas pasaron en mi mente.
During the talk, many things went through my mind.
'Pasaron' here describes the passage of time.