Release the mountains and rivers, withered ox

Quick answer：

This phrase appears to be a poetic or artistic expression. 'Release' could imply setting free or allowing to be as it is, 'mountains and rivers' often symbolize nature or the natural world, and 'withered ox' might represent something that has lost vitality or vigor. In the context of art, it could be a metaphor for the transition from decay to renewal or the release of something burdensome. In the context of Chinese philosophy or culture, it might relate to Taoist or Confucian ideas about living in harmony with nature or the passage of time.