From Longman Business Dictionary
snowballsnow·ball /ˈsnəʊbɔːlˈsnoʊbɒːl/ verb [intransitiveI] to grow or increase at a faster and faster rateOur sales in Europe have snowballed.
snowball into‘Primary Colors’ snowballed into one of the biggest-selling books of the year.
—snowballing adjectiveadj [only before a noun]a scheme to cover his snowballing losses