1. An underground pit or tank used for the collection and decomposition of human waste and sewage, typically in areas without access to municipal sewage systems
The rural house relied on a black pit for waste management.
A casa rural dependia de uma fossa negra para o tratamento de resíduos.
2. In astronomy, an alternative or colloquial term for a black hole
Scientists detected radiation near the black pit in space.
Os cientistas detectaram radiação próxima à fossa negra no espaço.