Sorry, no online dictionaries contain the exact phrase main rule.
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Reverse dictionary results:
1. primary
 2. fundamental
3. cardinal
4. central
5. key
6. main
7. main thing
8. maine
9. capital
10. chiefly
 11. core
12. first and foremost
13. mainprize
14. prime
15. crucial
16. essential
17. imperative
18. mission-critical
19. name of the game
20. primarily
 21. principal
22. simple majority
23. supermajority
24. absolute majority
25. built-in
26. capitall
27. essentials
28. instrumental
29. mainspring
30. of the essence
 31. predominately
32. presence
33. prevalently
34. primacy effect
35. primum mobile
36. qualified majority

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