Sorry, no online dictionaries contain the exact phrase harden on.
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Reverse dictionary results:
1. bake
2. cake
3. gel
4. hardened
5. hardening
6. indurate
7. inure
8. obdurate
9. season
10. set
11. steel
12. braze
13. brazing
14. embrawn
15. obdure
16. ossify
17. sear
18. steels
19. anneal
20. calcify
21. callous
22. cement
23. chill
24. chills
25. det
26. enure
27. face-harden
28. freeze
29. hard
30. hardener
31. hydraulic
32. inured
33. seasoned
34. sets
35. solidify
36. temper
37. thermosetting
38. toughen
39. acclimate
40. acclimated

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You can look up the words in the phrase individually using these links:   harden ?   on ?
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hard*to search for words beginning with hard, or
*n onto search for words ending with n on
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