Sorry, no online dictionaries contain the exact phrase prove to be false.
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Reverse dictionary results:
1. debunk
2. disprove
3. refute
4. falsify
5. contradict
6. disbelieve
7. gainsay
8. object
9. oppugn
10. confute
11. controvert
12. negative
13. rebut
14. refel
15. unreason
16. contravene
17. disaffirm
18. nay
19. negate
20. recrimination
21. defence
22. defense mechanism
23. defensive
24. denay
25. deny
26. disallow
27. disconfirm
28. disputer
29. improve
30. invalidate
31. rebuff
32. red light
33. remonstrator
34. sublate
35. tu quoque
36. contrectation

You can look up the words in the phrase individually using these links:   prove ?   to ?   be ?   false ?
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