1. A concealed or secret corridor, tunnel, or pathway that is not visible or easily accessible to the general public, typically built within walls or underground
The old castle had a hidden passage that led from the bedroom to the library.
O castelo antigo tinha uma passagem secreta que levava do quarto à biblioteca.
2. In literature, games, or media: a secret route or way to progress that is not immediately obvious
The treasure map revealed a hidden passage through the mountain.
O mapa do tesouro revelou uma passagem secreta através da montanha.