Sorry, no online dictionaries contain the exact phrase underlying cause.
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Reverse dictionary results:
1. root cause
2. fundamental cause
3. primary cause
4. underlying factor
5. reason
6. root
7. ground
8. grounded
9. reasoned
10. substratum
11. dynamic
12. wherefore
13. why
14. filariasis
15. basis
16. bottom
17. cases
18. causes
19. drift
20. flap
21. heave
22. premise
23. principle
24. rationale
25. reasons
26. set
27. stem
28. underlie
29. wit
30. det
31. sets
32. behind
33. apron
34. bump
35. flaps
36. aesthetic
37. base
38. basement
39. basic
40. bed

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