1. A simultaneous or coordinated decrease in value, quality, performance, or condition affecting multiple parties, entities, or aspects
The joint decline of both companies led to their eventual merger.
O declínio conjunto de ambas as empresas levou à sua fusão eventual.
2. In medical contexts, deterioration affecting multiple joints simultaneously
The patient experienced a joint decline in mobility across all limbs.
O paciente experimentou um declínio conjunto da mobilidade em todos os membros.