Sorry, no online dictionaries contain the exact phrase happen to know.
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Reverse dictionary results:
1. unfathomable
 2. unknown
3. unknowable
4. accelerate
5. accept
6. accomplish
7. accrue
8. accrued
9. achieve
10. achieved
 11. act
12. acting
13. acy
14. admit
15. admitted
16. afford
17. after
18. agree
19. alight
20. allow
 21. allowed
22. alright
23. alternate
24. alternating
25. announcement
26. anticipate
27. anticipated
28. anticipation
29. anything
30. aot
 31. apt
32. apy
33. are
34. arise
35. arises
36. arrive
37. arrived
38. arrives
39. arriving
40. authorizing

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You can look up the words in the phrase individually using these links:   happen ?   to ?   know ?
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Not helpful? You might try using the wildcards * and ? to find the word you're looking for. For example, use
happ*to search for words beginning with happ, or
*knowto search for words ending with know
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