Sorry, no online dictionaries contain the exact phrase core idea.
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Reverse dictionary results:
1. essence
 2. central concept
3. main principle
4. fundamental concept
5. key idea
6. burden
7. base
8. basis
9. belief
10. center
 11. centre
12. coring
13. crux
14. faith
15. focus
16. fundamental
17. gist
18. heart
19. hearts
20. home
 21. kernel
22. marrow
23. metastability
24. middle
25. nitty-gritty
26. nub
27. philosophy
28. pith
29. seed
30. stuff
 31. substance
32. substantive
33. theory
34. bottom
35. boil
36. corn
37. print
38. printed
39. prints

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You can look up the words in the phrase individually using these links:   core ?   idea ?
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core*to search for words beginning with core, or
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