1. A secret or concealed method of action used to achieve an objective without being detected or known
The resistance used clandestine tactics to undermine the occupation.
A resistência usou táticas clandestinas para minar a ocupação.
2. Covert operational methods employed in espionage, military strategy, or illicit activities
Intelligence agencies employ clandestine tactics to gather information.
As agências de inteligência empregam táticas clandestinas para coletar informações.