to keep someone in (or out), using a blockade, especially ships in a port
to close or block a road etc., using a barricade
A barrier constructed across a road, especially as a military defence
An obstacle, barrier, or bulwark.
A place of confrontation.
To fasten or secure with a deadbolt.
A kind of lock in which the bolt (moving portion) is held in position by the cylinder rather than by a spring and so cannot be retracted except by turning the cylinder.
The part of the lock which is moved when the key is engaged.