A place of confrontation.
A barrier constructed across a road, especially as a military defence
An obstacle, barrier, or bulwark.
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 deadlocked confrontation between antagonists.
A device which maintains a fixed distance between two objects, especially between a surface and a sign or electrical wiring.
For use at a distance sufficient from the target to allow defensive fire to be evaded.