Sorry, no online dictionaries contain the exact phrase undocumented machine instruction.

Reverse dictionary results:
1. macro
2. macro instruction
3. microcode
4. turn
5. subway
6. drop
7. anomalous
8. cave
9. caving
10. ced
11. dodge
12. dodging
13. error
14. flourish
15. flourishing
16. jargon
17. mass
18. metro
19. ore
20. pie
21. ramble
22. sewer
23. sprawl
24. sprawling
25. square
26. stab
27. stealth
28. tap
29. tapped
30. tapping
31. trust
32. turned
33. operation
34. run
35. document
36. documentation
37. information
38. literature
39. open
40. user

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You can look up the words in the phrase individually using these links:   undocumented ?   machine ?   instruction ?
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