Sorry, no online dictionaries contain the exact phrase tested and proven to work.
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Reverse dictionary results:
1. epic
 2. form
3. proofed
4. proofs
5. proof
6. established
7. prove
8. documented
9. show
10. demonstrate
 11. proving
12. showed
13. establish
14. induction
15. wash
16. guilty
17. was
18. were
19. cleared
20. confirm
 21. confirmed
22. fact
23. nostrum
24. obvious
25. substantiate
26. theorem
27. truth
28. testing
29. trial
30. audited
 31. audition
32. calorimeter
33. tried
34. verified
35. assess
36. checking
37. experience
38. job
39. prepared
40. test

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You can look up the words in the phrase individually using these links:   tested ?   and ?   proven ?   to ?   work ?
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