ring fence

noun
🔊/ˈrɪŋ fens/
🔊/ˈrɪŋ fens/
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  1. (finance金融) a form of protection that stops a sum of money from being spent on anything other than its intended purpose
    • The government has promised to put a ring fence around funding for education.政府已承诺教育资金保证用于教育。🔊🔊
  2. a form of protection that only allows particular people to use or know something, or only allows something to be used for a particular purpose
    • He did not say when the merger would be completed or when the ring fence would be abolished. 他没有透露合并何时完成或何时取消围栏。