1. An illegal or secret route taken to avoid detection by authorities, typically used for smuggling, human trafficking, or unauthorized border crossing
The refugees took a clandestine route through the mountains to avoid border patrols.
Os refugiados seguiram um trajeto clandestino através das montanhas para evitar as patrulhas de fronteira.
2. An underground pathway or hidden passage used for covert purposes
The network operated through clandestine routes known only to members.
A rede operava através de trajetos clandestinos conhecidos apenas pelos membros.