block off

(verb) obstruct access to. Synonyms: blockade, block off.

(verb) render unsuitable for passage. Synonyms: barricade, block, blockade, stop, block off, block up, bar. Examples: "Block the way." "Barricade the streets." "Stop the busy road."

(verb) block off the passage through. Synonyms: shut off, block off, close off. Example: "We shut off the valve."