ring-fence


Concise Oxford English Dictionary © 2008 Oxford University Press:
ring fence
noun
  • 1 a fence completely enclosing a piece of land.
  • 2 an effective barrier.
verb (ring-fence)
  • 1 enclose (land) with a ring fence.
  • 2 Brit. guarantee that (funds for a particular purpose) will not be spent on anything else.
'ring-fence' also found in these Oxford entries:

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