lock - definition and synonyms

noun
  1.   From our crowdsourced Open Dictionary
    used in politics to refer to a policy that will protect something or prevent it from being changed

    The PM pledged to keep the "triple lock" system, which ensures the state pension goes up by whichever is higher - inflation, wages or 2.5%.

    David Cameron is to unveil a five-year "tax lock" as he pledges people will always be able to keep more of their money under the Tories.

    Submitted from United Kingdom on 29/04/2015