razor wire

Also called razor ribbon.
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Based on the Random House Dictionary, © Random House, Inc. 2014.
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World English Dictionary
razor wire
 
n
strong wire with pieces of sharp metal set across it at close intervals, used to make fences or barriers

Collins English Dictionary - Complete & Unabridged 10th Edition
2009 © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins
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Example sentences
It's a daunting concrete barricade, three stories high, thorned with razor wire.
Deer graze calmly along the roadsides, beside chain-link fences topped with
  alternating coils of barbed wire and razor wire.
Their limbs are scarred with dog-bites and razor wire, the result of foiled
  attempts to cross the border.
Now you can get fined for not waiting for the razor wire encrusted gate to
  close behind you.
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