ringfence

noun

1. A fence which encircles a large area, or a whole estate, within one enclosure.

verb

1. (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.
2. (transitive)To specify that funds may only be used for a specific purpose, especially government funds.
3. (transitive)To require workers to remain in (particular types of work), as during wartime.

   “As on the docks, a wartime Essential Work Order gave the miners a minimum weekly wage and 'ring-fenced' employment in the industry. This constraint was not removed until 1950.”

   “Coalmining and agriculture were designated as 'ring-fenced' industries. As in wartime, the ministry was sparing in its use of legal sanctions, preferring to keep these powers in the background as far as possible. But in 1948, the ministry issued 302 directions, 288 of which required people to remain in mining or agriculture.”