Also found in: Dictionary, Thesaurus, Legal.
Like this video? Subscribe to our free daily email and get a new idiom video every day!
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.
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.