rester vigilant
Vous devez rester vigilant.
He said to stay alert coz the cops are pissed.
Il a dit de rester vigilants car les flics sont furieux.
— Elite Squad: The Enemy Within (2010)
You have to stay alert all the time.
Vous devez rester vigilant en permanence.
— Gangs of Wasseypur - Part 1 (2012)