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Across
  1. 5. Gradually breaking into pieces or falling apart
  2. 7. Old-fashioned term for "suppose"
  3. 9. Cause discomfort or anxiety
  4. 12. Introduction of something new or different
Down
  1. 1. Trouble or threaten persistently
  2. 2. Gradually spread through or over
  3. 3. Support or strengthen
  4. 4. Mark of disgrace associated with a particular circumstance, quality, or person
  5. 6. Process of interaction and integration among people, companies, and governments worldwide
  6. 8. Causing severe emotional shock or distress
  7. 10. Sentimental longing for the past
  8. 11. Complete change in form or appearance