Sorry, no online dictionaries contain the exact phrase challenge system.
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Reverse dictionary results:
1. defy
2. alarm
3. attacks
4. charge
5. charged
6. game
7. leak
8. maze
9. one
10. pipe
11. tackle
12. test
13. accounting
14. flood
15. alps
16. curve
17. dissent
18. double
19. grade
20. map
21. something
22. tax
23. was
24. appeal
25. attacking
26. avoidance
27. banter
28. bantering
29. barrier
30. brave
31. butt
32. call
33. cartel
34. charging
35. close
36. come
37. dent
38. difficulties
39. dive
40. draw

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