1. to work together with others toward a common goal by pooling resources, skills, or energy
The two companies decided to combine efforts to develop a new product.
As duas empresas decidiram unir esforços para desenvolver um novo produto.
2. to collaborate or cooperate in order to achieve something that would be difficult to accomplish alone
We need to combine efforts if we want to finish the project on time.
Precisamos unir esforços se quisermos terminar o projeto a tempo.