Slipage or Slippage: How To spell?
The word Slipage is misspelled against Slippage, a noun meaning "The act of slipping; also, the amount of slipping."
Slippage has double "pp" is mispronounced as "p"Remember double 'PP' in between the strings sli & age which should not be misspelled with single 'P'
Wrong Spelling:  sli-p-age  Correct Spelling:  sli-pp-age 
Find more wrongly spelled words of Slippage to spell it well.