荒(すさ)むto grow wild, to run to waste, to become degenerate, to become rough (of art, craft, etc.), to lose refinement, to deteriorate (of skill), to intensify (of wind, rain, etc.), to become more severe

辞書の定義

五段活用（マ行）, 自動詞
1. 1.
  EN to grow wild, to run to waste, to become degenerate
2. 2.
  EN to become rough (of art, craft, etc.), to lose refinement, to deteriorate (of skill)
五段活用（マ行）, 補助動詞
1. 3.
  EN to intensify (of wind, rain, etc.), to become more severe
  usu. after -masu stem