Sorry, no online dictionaries contain the exact phrase be sure of.
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Reverse dictionary results:
1. ensure
 2. confirm
3. verify
4. ascertain
5. guarantee
6. certify
7. able
8. acknowledgment
9. answer for
10. appraisal
 11. assure
12. attest
13. attribute
14. authenticate
15. building permit
16. congree
17. homologate
18. make certain
19. make sure
20. ok
 21. planning permission
22. secure
23. vouch
24. vouch for
25. voucher
26. vouchsafe
27. warrant
28. acceptance
29. accommodation
30. accordance
 31. accredit
32. affirmer
33. afford
34. allowance
35. answer to
36. apprise

You can look up the words in the phrase individually using these links:   be ?   sure ?   of ?
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