Sorry, no online dictionaries contain the exact phrase invalidate an argument.
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Reverse dictionary results:
1. knockout
 2. defend
3. defending
4. disprove
5. upset
6. avoid
7. break
8. negate
9. overturned
10. overturning
 11. cancel
12. cancelled
13. flaw
14. null
15. overturn
16. undo
17. void
18. instance
19. takeoff
20. argue
 21. confound
22. confute
23. contest
24. contradiction
25. contravene
26. controvert
27. cross
28. defense
29. dispute
30. disputed
 31. disputing
32. elide
33. embroil
34. embroiled
35. excuse
36. grounded
37. impregnable
38. impugn
39. oppugn
40. overrule

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You can look up the words in the phrase individually using these links:   invalidate ?   an ?   argument ?
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