die off

• 相继死去，一个个死掉；绝种；顺次枯死；(声音等)逐渐消失：

  The refugees were dying off from disease.

  难民们相继因病丧身。

  The species is dying off.

  该物种面临绝种。

  Those languages are in danger of dying off.

  那些语言正处于消亡的危险之中。