1. A hidden or covert path, course, or itinerary known only to a select few; used for clandestine travel or operations
The refugees were guided along a secret route to escape the occupied territory.
Os refugiados foram guiados por uma rota secreta para escapar do território ocupado.
2. In intelligence or espionage contexts, an undisclosed channel or method of communication or movement
The spy network used a secret route to deliver classified documents.
A rede de espiões usava uma rota secreta para entregar documentos classificados.