1. to explain or describe something in detail at great length
The professor decided to elaborate extensively on the theory during the lecture.
O professor decidiu elaborar extensivamente sobre a teoria durante a aula.
2. to develop or expand an idea, plan, or statement with comprehensive information
She elaborated extensively on her proposal to ensure everyone understood the details.
Ela elaborou extensivamente sobre sua proposta para garantir que todos compreendessem os detalhes.