Definition from Wiktionary, the free dictionary
ringfence (plural ringfences)
- A fence which encircles a large area, or a whole estate, within one enclosure.
- (transitive) to guarantee the safety of funds or investment. In particular, to ensure some degree of distinction for monies, that may provide immunity against untoward financial claims.
- (transitive) to specify that funds may only be used for a specific purpose, especially government funds
to specify that funds may only be used for a specific purpose