Usage Note
Verrouiller means to lock with a bolt or to lock a device (phone screen, car door). The noun verrou is a bolt or lock; mettre le verrou means 'to bolt the door'. In digital contexts, verrouiller l'écran ('to lock the screen') is standard terminology.
Examples
"N'oublie pas de verrouiller la porte."
Natural Translation
Don't forget to lock the door.

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