This is the 4623rd most frequent Portuguese word.
decidiram
"Decidiram" means "they decided" in English.
In this sentence, 'decidiram' is used in its third person plural form of the past tense, indicating that 'they' made a decision in the past to travel.
Eles decidiram viajar para o Brasil nas férias.
They decided to travel to Brazil during the holidays.
Here, 'decidiram' is in the second person plural form of the past tense, expressing an action of deciding that may relate to future plans.
Vocês decidiram o que vão fazer amanhã?
Have you decided what you are going to do tomorrow?
In this case, 'decidiram' illustrates the third person plural past tense, showing that multiple teams resolved to act differently following discussions.