Definition of underbrush noun from the Oxford Advanced American Dictionary

     

    underbrush

     noun
    noun
    NAmE//ˈʌndərˌbrʌʃ//
     
    [uncountable]
     
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  1. 1a mass of bushes and plants that grow close together under trees in woods and forests synonym undergrowth
  2. 2 The dog came crashing through the underbrush toward us.
See the Oxford Advanced Learner's Dictionary entry: underbrush