Sorry, no online dictionaries contain the exact phrase opposite of undo.
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Reverse dictionary results:
1. cancel
2. erase
3. erode
4. reverse
5. slip
6. untie
7. untwist
8. loose
9. revoke
10. stet
11. dis
12. eraser
13. reversed
14. abort
15. defeated
16. disconnect
17. dismantle
18. dismantled
19. dismantling
20. reactionary
21. rip
22. undone
23. unlock
24. unlocking
25. unmake
26. unwrap
27. demodulate
28. irreversible
29. reunify
30. undight
31. undoable
32. about-face
33. afro
34. aid
35. aided
36. arrive
37. away
38. back
39. bak
40. bang

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You can look up the words in the phrase individually using these links:   opposite ?   of ?   undo ?
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oppo*to search for words beginning with oppo, or
*undoto search for words ending with undo
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