chip away at

• • 从…抽去实质性的东西
  • 削弱；损害；一点点地除掉：

    He is chipping away at a block marble with a chisel.

    他正在用凿子在大理石上不停地凿。

    The manager kept chipping away at the problem until he had solved it.

    经理一直在琢磨这个问题，直到把它解决为止。