Words that are their own antonyms
  1. Sanction
    To approve or boycott
  2. Buckle
    To connect, or to break or collapse
  3. Cleave
    To adhere or separate
  4. Clip
    To fasten, or detach
  5. Dust
    To add fine particles, or to remove them
  6. Fast
    Quick, or stuck/made stable
  7. Garnish
    To furnish, as with food preparation, or to take away, as with wages
  8. Go
    To proceed, or to weaken/fail
  9. Hold up
    To support, or impede
  10. Overlook
    To supervise, or to neglect
  11. Temper
    To soften, or to strengthen
  12. Weather
    To withstand, or to wear away
  13. Bolt
    To secure, or to flee
  14. Ravel
    To tangle or knot/to untangle or unravel
    Suggested by @gwcoffey