Contranym Crossword: words with conradictionary meanings, acting as their own opposites

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Across
  1. 1. To repair, or to castrate
  2. 4. Add or remove particles
  3. 6. To endure or wear away
  4. 7. A common practice, or a special treatment
  5. 10. To show or to obfuscate
  6. 12. To supervise, or to neglect
Down
  1. 1. Moving quickly or firmly fixed
  2. 2. To approve or to condemn
  3. 3. Split or stick together
  4. 5. To act, or refuse to
  5. 8. A journey, or a stumble
  6. 9. Run away or secure in place
  7. 11. To attach something or to cut off