To seal an opening, so as to prevent the entry of draughts.
That prevents the entry of draughts.
To secure; to make people stay locked indoors for their safety.
To make an arrangement secure, definite, or permanent; to fix.
To cause another to enter into an exclusive romantic relationship.
To travel through a flight of locks on a waterway in a downhill direction.
To limit the use of a computer network to only users with permission.