Sorry, no online dictionaries contain the exact phrase harden upon.
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Reverse dictionary results:
1. cement
2. det
3. fix
4. sets
5. fic
6. flesh
7. freeze
8. hard
9. set
10. stone
11. plank
12. jig
13. anneal
14. hydraulic
15. obdurate
16. pan
17. seasoned
18. steels
19. thermosetting
20. burning
21. endure
22. fire
23. gel
24. hardened
25. inured
26. kern
27. kernel
28. season
29. after
30. anvil
31. assail
32. assault
33. assess
34. assessing
35. attack
36. attacking
37. attacks
38. average
39. bait
40. beset

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