An obstacle, barrier, or bulwark.
A barrier constructed across a road, especially as a military defence
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 projecting part of a rampart or other fortification.
A well-fortified position; a stronghold or citadel.
A person, group, or thing, that strongly defends some principle.
Any large prominence; something that resembles a bastion in size and form.
To furnish with a bastion.