1. A hidden corridor, tunnel, or route concealed within a building or structure, designed to allow passage without being seen or discovered
The old mansion had a secret passage behind the bookshelf that led to the underground vault.
A mansão antiga tinha uma passagem secreta atrás da estante que levava ao cofre subterrâneo.
2. A covert or hidden means of access or escape
During the war, refugees used secret passages to escape the occupied territory.
Durante a guerra, os refugiados usavam passagens secretas para escapar do território ocupado.