[n] a war measure that isolates some area of importance to the enemy
[n] prevents access or progress
[v] impose a blockade on
[v] obstruct access to
[v] render unsuitable for passage; "block the way"; "barricade the streets"
[v] hinder or prevent the progress or accomplishment of; "His brother blocked him at every turn"
bar, barricade, block, block, block off, block off, block up, embarrass, encirclement, hinder, obstruct, seal off, stymie, stymy