To support, countenance, maintain, uphold, or aid (any good cause, opinion, or action); to maintain.
To incite; to assist or encourage by aid or countenance in crime.
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 barrier constructed across a road, especially as a military defence
An obstacle, barrier, or bulwark.
A place of confrontation.