Creeping inflation

Creeping inflation : Circumstance where the inflation of a nation increases gradually, but continually, over time. This tends to be a typically pattern for many nations. Although the increase is relatively small in the short-term, as it continues over time the effect will become greater and greater. (Taken from http://www.businessdictionary.com/definition/creeping-inflation.html )



Now a husband's definition: 

Son: Dad, what is creeping inflation?

Father: It's when your mother starts out asking for new shoes and ends up with a complete new outfit.

creeping = grimpant, insidieux
to end up with = se trouver avec, finir avec 
an outfit = une tenue