verb [ vn ] ( BrE )
1.
( finance ) to protect a particular sum of money by putting restrictions on it so that it can only be used for a particular purpose
2.
to protect sth by putting restrictions on it so that it can only be used by particular people or for a particular purpose :
All employees can access the parts of the Intranet that are not ring-fenced.
► ˈring fence noun :
The government has promised to put a ring fence around funding for education.