Definition of snowball verb from the Oxford Advanced American Dictionary

 

snowball

 verb
verb
NAmE//ˈsnoʊbɔl//
 
[intransitive]Verb Forms present simple I / you / we / they snowball
 
he / she / it snowballs
 
past simple snowballed
 
-ing form snowballing
 
 
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if a problem, a plan, an activity, etc. snowballs, it quickly becomes much bigger, more serious, more important, etc. Opposition to the proposals has snowballed.
See the Oxford Advanced Learner's Dictionary entry: snowball