creeping
From Longman Business Dictionarycreepingcreep‧ing /ˈkriːpɪŋ/ adjective [only before a noun] disapproving gradually becoming stronger and gaining more influence, but so slowly that people do not noticelegislation that paved the way for the creeping privatisation of the health serviceCreeping inflation during the 1960s and periods of rapid inflation in the 1970s and 1980s reduced the value of the currency.