snowball - definition and synonyms

verb [intransitive] 

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/ˈsnəʊˌbɔːl/
present tense
I/you/we/theysnowball
he/she/itsnowballs
present participlesnowballing
past tensesnowballed
past participlesnowballed
  1. to develop quickly and become very big or serious

    The business just snowballed and before long they’d opened another branch.