1. A path, route, or trail that has been abandoned and is no longer commonly used or remembered
We discovered a forgotten trail deep in the forest.
Descobrimos uma trilha esquecida bem no fundo da floresta.
2. Figuratively, an abandoned course of action, idea, or memory that has been neglected over time
He decided to revisit that forgotten trail from his past.
Ele decidiu revisitar aquela trilha esquecida do seu passado.