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Across
  1. 2. to hide something so it cannot be seen or found.
  2. 4. a drug that makes someone calm or sleepy.
  3. 5. to keep something safe or unchanged over time.
  4. 6. to remove a substance from the body or a system.
Down
  1. 1. a sudden episode of uncontrolled movements caused by unusual brain activity.
  2. 3. an attempt to resist or overthrow those in power.