close off

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close off

1. To prevent access to a particular area or thing. In this usage, a noun or pronoun can be used between "close" and "off." We had to close off that section of the restaurant for a private party. I had to take a detour on my way home because the water department closed a bunch of streets off.
2. To avoid emotional connection with others; to isolate. In this usage, a reflexive pronoun can be used between "close" and "off." Todd really closed himself off after his last break-up. I have a hard time making friends because I usually close myself off from other people.
3. To refuse to listen to viewpoints, ideas, or opinions that differ from one's own. In this usage, a reflexive pronoun can be used between "close" and "off." Grandpa, you can't just close yourself off to the ways of the modern world. Can you please listen to what I think, instead of automatically closing yourself off?
See also: close, off
Farlex Dictionary of Idioms. © 2015 Farlex, Inc, all rights reserved.

close something off

to prevent entrance into something; to block something off. Please don't close this passageway off. They closed off the passageway anyway.
See also: close, off
McGraw-Hill Dictionary of American Idioms and Phrasal Verbs. © 2002 by The McGraw-Hill Companies, Inc.

close off

v.
To prevent passage along or through something: The police closed off the main avenue for a parade. Park rangers closed the lake off to motorboats.
See also: close, off
The American Heritage® Dictionary of Phrasal Verbs. Copyright © 2005 by Houghton Mifflin Harcourt Publishing Company. Published by Houghton Mifflin Harcourt Publishing Company. All rights reserved.
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References in periodicals archive ?
Other recommendations include turning off unnecessary lights, minimizing the use of electrical appliances during the day since they generate heat, and closing off pilots on a gas stove.
You can save energy used for heating or cooling by closing off one or more rooms or an entire house.
But when the head is tipped back, closing off the airway relies more on manipulation of the tongue.
The reverse circulation would have broken down when plate tectonics began pushing Africa and Arabia toward Eurasia, closing off the Tethys.
But closing off Holland Street is a big stumbling block."
The legendary gallcrist Konrad Fischer, a champion of Conceptual and Minimalist art on both sides of the Atlantic, created his first gallery space in 1967 by closing off a courtyard passageway in the Neubruckstrasse in Dusseldorf.
A CHEMICAL tanker spilled its load today closing off the road into Barry Docks.
Officers rushed to the scene, closing off the street, neighbouring Vyse Street and Spencer Street.