concertina wire

noun
wire with razor-sharp edges or projections, placed in coils as a barrier along the tops of fences or walls, as at a prison.
Also called concertina, barbed tape, razor wire.


Origin:
1925–30

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Based on the Random House Dictionary, © Random House, Inc. 2014.
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Example sentences
The equatorial sun blazed directly overhead, cutting shadows as sharp as
  concertina wire.
In the middle, a chain-link fence topped with concertina wire surrounds a
  series of khaki tents.
Hundreds of these demonstrators pressed right up to the concertina wire.
The fence was topped with concertina wire, harshly lit, and backed by
  watchtowers every few hundred yards.
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