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 straiten; restrict; constrain; limit.
To surround; beset; plague; hinder.
To hedge about; surround with or as with a hedge.
To determine the boundary or limit of; define.