a reduction in the rate, amount, or standard of something减少,降低
The party leader is said to be concerned at the slippage (= loss of popularity) in the recent opinion polls.据称,该党领导人对最近民意测验中支持率的下滑感到忧心忡忡。
a failure to happen or finish on time未能按时发生(或完成)
the slippage of the book's publication date这本书出版的推迟