Definition of slippage noun from the Oxford Advanced American Dictionary

     

    slippage

     noun
    noun
    NAmE//ˈslɪpɪdʒ//
     
    [uncountable, countable, usually singular]
     
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  1. 1failure to achieve an aim or complete a task by a particular date The smallest slippage could delay completion of the project.
  2. 2a slight or gradual fall in the amount, value, etc. of something There has been some slippage of support for the government's policies.
See the Oxford Advanced Learner's Dictionary entry: slippage