Sorry, no online dictionaries contain the exact phrase prove to be true.
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Reverse dictionary results:
1. verify
 2. confirm
3. validate
4. demonstrate
5. substantiate
6. justify
7. prove
8. assert
9. avouch
10. constate
 11. affirm
12. affirmer
13. answer to
14. ascertainment
15. attest
16. authenticate
17. aver
18. avouchment
19. certify
20. confirmation
 21. confirme
22. enable
23. know
24. proof
25. ratihabition
26. reassurance
27. soothe
28. stipulate
29. support
30. sustentative
 31. affirmance
32. affirmant
33. affirmation
34. agreement
35. answer for
36. appraisal

You can look up the words in the phrase individually using these links:   prove ?   to ?   be ?   true ?
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prov*to search for words beginning with prov, or
*trueto search for words ending with true
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