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concertina wire

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

First recorded in 1925–30
Also called concertina, barbed tape, razor wire.
Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2018