This is the 1527th most frequent Portuguese word.
fiz
"Fiz" means "I did" or "I made" in English.
In this sentence, 'fiz' indicates the past tense of 'fazer' (to make) to express an action the subject (I) completed, specifically preparing dinner.
Eu fiz o jantar esta noite.
I made dinner tonight.
Here, 'fiz' conveys the past tense of 'fazer' (to do) to describe the effort put into an activity.
Fiz o meu melhor no trabalho hoje.
I did my best at work today.
This example uses 'fiz' to indicate the completion of a helpful action in the past.