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 protect or preserve from.
To make and cause to remain secret.
To prevent or restrain (someone or something) from; to refrain or cause to refrain from.
To cause to be excluded or not present.