hushing
  沖刷找礦法
  Hush·ing, n. Mining The process of washing ore, or of uncovering mineral veins, by a heavy discharge of water from a reservoir; flushing; -- also called booming and hydraulic mining.
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  Hush v. t. [imp. & p. p. Hushed p. pr. & vb. n. Hushing.]
  1. To still; to silence; to calm; to make quiet; to repress the noise or clamor of.
     My tongue shall hush again this storm of war.   --Shak.
  2. To appease; to allay; to calm; to soothe.
  With thou, then,
  Hush my cares?   --Otway.
     And hush'd my deepest grief of all.   --Tennyson.
  To hush up, to procure silence concerning; to suppress; to keep secret. “This matter is hushed up.”