scrap heap
noun uk/ˈskræp ˌhiːp/ us/ˈskræp ˌhiːp/
[ C ]废物堆（尤指废金属堆）
a pile of old, unwanted things, especially pieces of metal
[ S ]（思想或人）无人感兴趣的
If an idea or person is on the scrap heap, people are no longer interested in them.
Some people believe that Communism has been relegated/consigned to the scrap heap of history.
Many top class players end up on the scrap heap after a short career. 许多顶级选手很快就被人遗忘了。