This is the 6631st most frequent Portuguese word.
fico
"Fico" means "I stay," "I remain," or "I am staying."
Here, 'fico' is the first-person present tense of the verb 'ficar', meaning 'to stay'.
Eu fico em casa durante o fim de semana.
I stay at home during the weekend.
In this sentence, 'fico' expresses a change of state, meaning 'I become' happy.
Fico feliz por você ter conseguido o emprego.
I am happy that you got the job.
Here, 'fico' describes a state of being or feeling that occurs.