Sorry, no online dictionaries contain the exact phrase expand upon an idea.
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Reverse dictionary results:
1. enlarge
 2. elaborate
3. swell
4. swelled
5. labour
6. amplify
7. add
8. labouring
9. revolve
10. revolved
 11. bottom
12. cast
13. fancy
14. trespass
15. insert
16. specify
17. motion
18. perspicuity
19. pique
20. develop
 21. expatiate
22. dilate
23. realize
24. realized
25. development
26. dawn
27. open
28. reach
29. stretch
30. expanse
 31. overextend
32. spread
33. spreading
34. pad
35. psd
36. raise
37. build
38. developing
39. dumdum
40. eat

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You can look up the words in the phrase individually using these links:   expand ?   upon ?   an ?   idea ?
(A question mark next to a word above means that we couldn't find it, but clicking the word might provide spelling suggestions.)

Not helpful? You might try using the wildcards * and ? to find the word you're looking for. For example, use
expa*to search for words beginning with expa, or
*ideato search for words ending with idea
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