1. A border between countries or regions that has been officially closed to prevent passage of people, goods, or information
The government imposed a sealed border to contain the spread of the virus.
O governo impôs uma fronteira selada para conter a propagação do vírus.
2. A boundary that is physically secured or blockaded to prevent unauthorized crossing
The sealed border was heavily guarded by military personnel.
A fronteira selada era fortemente guardada por pessoal militar.