Sorry, no online dictionaries contain the exact phrase could be true or false.
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Reverse dictionary results:
1. proposition
 2. not
3. show
4. showed
5. invalid
6. unfalsifiable
7. condition
8. conditions
9. boolean
10. truth-value
 11. contingent
12. negation
13. discolor
14. profession
15. hoax
16. lie
17. lies
18. real
19. truth
20. argument
 21. necessary
22. test
23. inconsistent
24. untrue
25. pretension
26. veracious
27. equivalence
28. logic
29. belie
30. conditional
 31. deceive
32. disbelieve
33. disguise
34. disloyal
35. dissemble
36. factoid
37. lir
38. specious
39. untruthful
40. pseudodox

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You can look up the words in the phrase individually using these links:   could ?   be ?   true ?   or ?   false ?
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