1. to establish or define the boundaries or limits of something, such as a territory, region, or area of responsibility
The two countries agreed to set borders along the river.
Os dois países concordaram em estabelecer fronteiras ao longo do rio.
2. to establish limits or boundaries in a relationship or personal context
It's important to set borders in your relationships to maintain healthy boundaries.
É importante estabelecer fronteiras em seus relacionamentos para manter limites saudáveis.