ring ‧ fence /ˈrɪŋfens/ BrE AmE verb [transitive] British English
to decide officially that something, especially money, can only be used for a particular purpose:
OK, so this £20,000 is ringfenced as the training budget.
ring ‧ fence /ˈrɪŋfens/ BrE AmE verb [transitive] British English
to decide officially that something, especially money, can only be used for a particular purpose:
OK, so this £20,000 is ringfenced as the training budget.
Longman Dictionary of Contemporary English. Longman - Словарь современного английского языка. 2012