Sorry, no online dictionaries contain the exact phrase to let someone down.
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Reverse dictionary results:
1. disappoint
2. fail
3. desert
4. abandon
5. neglect
6. disregard
7. draw a blank
8. forsake
9. aberr
10. amit
11. ignore
12. indispose
13. unbecome
14. defeasance
15. defeat
16. disadvantage
17. discount
18. failer
19. fordo
20. forpine
21. irritate
22. leave out
23. lose sight of
24. oversight
25. aberrate
26. call
27. delude
28. disrate
29. downgrade
30. downplay
31. dry
32. err
33. eschew
34. faile
35. foredo
36. forget about
37. forget oneself

You can look up the words in the phrase individually using these links:   to ?   let ?   someone ?   down ?
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