a fence completely enclosing a farm or piece of land.
an effective or comprehensive barrier:he did not say when the merger would be completed or when the ring fence would be abolished
verb
(ring-fence) [with object]
1enclose (a piece of land) with a ring fence.
2British guarantee that (funds allocated for a particular purpose) will not be spent on anything else:the government failed to ring-fence the money provided to schools
