A barrier constructed across a road, especially as a military defence
An obstacle, barrier, or bulwark.
A place of confrontation.
to close or block a road etc., using a barricade
to keep someone in (or out), using a blockade, especially ships in a port
A sturdy military fortification, often of concrete, with gunports.
A reinforced building from which to control hazardous operations, such as an explosion or a rocket launch.