Sorry, no online dictionaries contain the exact phrase opposite of brighten.
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Reverse dictionary results:
1. bedim
 2. flare
3. elate
4. light
5. smile
6. clear
7. gild
8. gilded
9. lighten
10. bright
 11. burn
12. cheer
13. jazz
14. perk
15. polish
16. rub
17. acquit
18. antithesis
19. away
20. bear
 21. erase
22. hook
23. iff
24. lift
25. luft
26. off
27. pff
28. acquitted
29. amortize
30. assert
 31. assertively
32. block
33. buffer
34. buffing
35. burn off
36. cant
37. clean
38. cleaned
39. cowcatcher
40. crystal

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You can look up the words in the phrase individually using these links:   opposite ?   of ?   brighten ?
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*htento search for words ending with hten
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