1. An indirect or covert reference to something, made in a delicate or understated manner without explicit mention
The author made a subtle allusion to classical mythology in her novel.
A autora fez uma alusão sutil à mitologia clássica em seu romance.
2. A hint or suggestion that is not obvious or direct, requiring interpretation
His comment was a subtle allusion to the scandal from years ago.
Seu comentário era uma alusão sutil ao escândalo de anos atrás.