This is the 2809th most frequent Spanish word.
pasan
"Pass" or "happen" (third-person plural form of the verb "pasar").
The word 'pasan' is used in the sense of 'passing' or 'going by' with reference to time, indicating the progression of days in this context.
Los días pasan rápido cuando estás ocupado.
The days go by quickly when you are busy.
Here, 'pasan' refers to 'spending time,' which implies participating in an activity (playing soccer) during the afternoons.
Ellos pasan las tardes jugando al fútbol en el parque.
They spend their afternoons playing soccer in the park.
In this example, 'pasan' means 'passing by' in the spatial sense, denoting movement in front of the house as the children go to school.