1. A subject or matter that has been neglected, disregarded, or no longer discussed
Climate change was once a forgotten topic in political debates.
A mudança climática era um tema esquecido nos debates políticos.
2. A theme or issue that has lost relevance or public attention over time
The historical injustices became a forgotten topic for many generations.
As injustiças históricas tornaram-se um tema esquecido para muitas gerações.