grind down

• • 碾碎；把…磨碎成粉末：

    The rice will grind down into flour.

    这米要磨成粉。

  • 磨快；磨光；磨薄：

    A new knife needs to be ground down to get it really sharp.

    一把新刀子需要开口磨快才能真正锋利。

  • 压迫，压倒；折磨，虐待：

    They were ground down by taxation.

    他们被税收压榨得直不起腰来。