Sorry, no online dictionaries contain the exact phrase backs up a claim.
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Reverse dictionary results:
1. support
2. corroborate
3. validate
4. substantiate
5. answer to
6. assert
7. authenticate
8. confirm
9. consense
10. constate
11. justify
12. prove
13. verify
14. acceptance
15. accord
16. affirm
17. affirmer
18. appraisal
19. ascertain
20. ascertainment
21. assess
22. attest
23. attribute
24. aver
25. avouch
26. certify
27. confirmation
28. confirme
29. congree
30. enable
31. homologate
32. ok
33. proof
34. provand
35. ratihabition
36. reassurance

You can look up the words in the phrase individually using these links:   backs ?   up ?   a ?   claim ?
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