slippage /ˈslɪpɪdʒ/

• 1. 

  N-VAR Slippage is a failure to maintain a steady position or rate of progress, so that a particular target or standard is not achieved. (位置﹑水准等方面) 下降

  例：

  ...a substantial slippage in the value of sterling.

  … 英国货币的大幅度贬值。