Definition of mushroom verb from the Oxford Advanced American Dictionary

     

    mushroom

     verb
    verb
    NAmE//ˈmʌʃrum//
     
    , NAmE//ˈmʌʃrʊm//
     
    Verb Forms present simple I / you / we / they mushroom
     
    ,
     
    he / she / it mushrooms
     
    ,
     
    past simple mushroomed
     
    ,
     
    -ing form mushrooming
     
    ,
     
     
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  1. 1[intransitive] to rapidly grow or increase in number We expect the market to mushroom in the next two years.
  2. 2go mushrooming [intransitive] to gather mushrooms in a field or wood
See the Oxford Advanced Learner's Dictionary entry: mushroom