Sorry, no online dictionaries contain the exact phrase be for certain.
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Reverse dictionary results:
1. assured
2. bound
3. clear
4. confident
5. definite
6. firm
7. know
8. part
9. positive
10. reliable
11. safe
12. secure
13. some
14. sure
15. true
16. actions
17. activities
18. additives
19. adjustments
20. advantages
21. affirm
22. amendments
23. amounts
24. applications
25. archbishopric
26. areas
27. articles
28. aspects
29. assert
30. assets
31. balance
32. benefits
33. bodies
34. candidates
35. cases
36. categories
37. certainly
38. challenges
39. changes
40. characteristics

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You can look up the words in the phrase individually using these links:   be ?   for ?   certain ?
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be f*to search for words beginning with be f, or
*tainto search for words ending with tain
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