1. To end a dispute or disagreement by reaching an agreement or decision
Let's settle it once and for all.
Vamos resolver isso de uma vez por todas.
2. To decide or determine something that was uncertain or contested
We need to settle it in court.
Precisamos resolver isso na justiça.
3. To resolve a conflict, often through negotiation or compromise
They decided to settle it through mediation.
Eles decidiram resolver isso através de mediação.