noun

An improvised barrier erected across a street or other thoroughfare to prevent or delay the movement of opposing forces.

the police action led to riots, with hundreds of demonstrators building barricades and burning vehicles

barrier,obstacle,blockade,bar,fence,obstruction,roadblock,bulwark,stockade,rampart,palisade,hurdle,protection,defence

verb

Block or defend with a barricade.

they barricaded the building and occupied it all night

blockade,obstruct,close up,bar,block off,shut in,shut off,fence in,seal up,defend,protect,fortify,strengthen