Sorry, no online dictionaries contain the exact phrase know for certain.
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Reverse dictionary results:
1. ascertain
 2. determine
3. verify
4. confirm
5. answer to
6. constate
7. prove
8. substantiate
9. accord
10. ascertainment
 11. assess
12. attribute
13. authenticate
14. compromise
15. congree
16. consense
17. enable
18. homologate
19. justify
20. ok
 21. recognize
22. stipulate
23. support
24. sustentative
25. validate
26. valuate
27. acceptance
28. accommodation
29. admission
30. affirm
 31. affirmer
32. agreer
33. allow for
34. answer for
35. appraisal
36. appraising
37. apprise

You can look up the words in the phrase individually using these links:   know ?   for ?   certain ?
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