1. A confidential or clandestine agreement between two or more parties, typically kept hidden from public knowledge or third parties
The two companies reached a secret agreement to merge their operations.
As duas empresas chegaram a um acordo secreto para fusionar suas operações.
2. An informal or undisclosed understanding or arrangement between individuals or groups
They had a secret agreement not to compete in each other's markets.
Eles tinham um acordo secreto de não competir nos mercados um do outro.