Definition of mushroom verb from the Oxford Advanced Learner's Dictionary

     

    mushroom

     verb
    verb
    BrE BrE//ˈmʌʃrʊm//
     
    ; NAmE NAmE//ˈmʌʃrʊm//
     
    ; BrE BrE//ˈmʌʃruːm//
     
    ; NAmE NAmE//ˈmʌʃruːm//
     
    Verb Forms present simple I / you / we / they mushroom
    BrE BrE//ˈmʌʃrʊm//
     
    ; NAmE NAmE//ˈmʌʃrʊm//
     
    ; BrE BrE//ˈmʌʃruːm//
     
    ; NAmE NAmE//ˈmʌʃruːm//
     
    he / she / it mushrooms
    BrE BrE//ˈmʌʃrʊmz//
     
    ; NAmE NAmE//ˈmʌʃrʊmz//
     
    ; BrE BrE//ˈmʌʃruːmz//
     
    ; NAmE NAmE//ˈmʌʃruːmz//
     
    past simple mushroomed
    BrE BrE//ˈmʌʃrʊmd//
     
    ; NAmE NAmE//ˈmʌʃrʊmd//
     
    ; BrE BrE//ˈmʌʃruːmd//
     
    ; NAmE NAmE//ˈmʌʃruːmd//
     
    past participle mushroomed
    BrE BrE//ˈmʌʃrʊmd//
     
    ; NAmE NAmE//ˈmʌʃrʊmd//
     
    ; BrE BrE//ˈmʌʃruːmd//
     
    ; NAmE NAmE//ˈmʌʃruːmd//
     
    -ing form mushrooming
    BrE BrE//ˈmʌʃrʊmɪŋ//
     
    ; NAmE NAmE//ˈmʌʃrʊmɪŋ//
     
    ; BrE BrE//ˈmʌʃruːmɪŋ//
     
    ; NAmE NAmE//ˈmʌʃruːmɪŋ//
     
     
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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. Suppliers have mushroomed to meet the demand.
  2. 2(also go mushrooming) [intransitive] to gather mushrooms in a field or wood
  3. Word Origin late Middle English (originally denoting any fungus having a fleshy fruiting body): from Old French mousseron, from late Latin mussirio(n-).
See the Oxford Advanced American Dictionary entry: mushroom