What is the meaning of Assistir?

to attend

to attend

to assist (to help, especially in a secondary role)

to watch; to witness; to attend [with a or direct object ‘a broadcast, performance, event, etc.’]

or also to assist (to help, especially in a secondary role)

with preposition en; to live; to reside

with clause subject; It's up to.

Source: wiktionary.org