1. to make a choice between two opposing positions, groups, or options; to stop being neutral and declare support for one party
You need to pick a side in this debate - you can't stay neutral forever.
Você precisa escolher um lado neste debate - não pode ficar neutro para sempre.
2. to decide to support or align with a particular group, team, or faction
During the conflict, many countries had to pick a side.
Durante o conflito, muitos países tiveram que escolher um lado.