block off

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block off

To prevent access to a particular area or thing. We had to block off that section of the restaurant for a private party. I had to take a detour on my way home because the water department blocked off a bunch of streets. Some of the names on this list are blocked out, which means they're top secret.
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block something off

to prevent movement through something by putting up a barrier; to close a passageway. Sam blocked the corridor off with a row of chairs. He used some chairs to block off the hallway.
See also: block, off