Real Dictionary

barricade
countable noun: A barricade is a line of vehicles or other objects placed across a road or open space to stop people getting past, for example during street fighting or as a protest.
verb: If you barricade something such as a road or an entrance, you place a barricade or barrier across it, usually to stop someone getting in.
verb: If you barricade yourself inside a room or building, you place barriers across the door or entrance so that other people cannot get in.

barricade in American English
a barrier thrown up hastily for defense, as in street fighting
to shut in or keep out with a barricade
noun: a defensive barrier hastily constructed, as in a street, to stop an enemy
transitive verb: to obstruct or block with a barricade

barricade in British English
to erect a barricade across (an entrance, passageway, etc) or at points of access to (a room, district of a town, etc)
noun: a barrier for defence, esp one erected hastily, as during street fighting