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razor wire

American  

razor wire British  

noun

  1. strong wire with pieces of sharp metal set across it at close intervals, used to make fences or barriers

"Collins English Dictionary — Complete & Unabridged" 2012 Digital Edition © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009, 2012

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Example Sentences

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Both are protected by miles of deep anti-tank ditches filled with razor wire and concrete anti-tank obstacles known as "dragon's teeth".

From BBC

Security at the camp fell apart in recent weeks after Syria’s government routed the U.S.-backed Syrian Democratic Forces, which had guarded Al-Hol for years, raising concerns about the release of people who might have become radicalized during the years held behind the razor wire.

From The Wall Street Journal

Long ditches lined with coils of razor wire and concrete pyramids known as dragon’s teeth await Russia’s increasingly rare armored attacks.

From The Wall Street Journal

Once a symbol of cooperation, the 'Friendship Bridge' connecting the two snow-covered banks has been reinforced with rows of razor wire and anti-tank obstacles.

From Barron's

It glitters from a distance: Where the 30-foot steel border fence ends, great spirals of razor wire extend up craggy mountain slopes on either side.

From Los Angeles Times