Sorry, no online dictionaries contain the exact phrase to toughen.
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Reverse dictionary results:
1. anneal
2. harden
3. inure
4. taff
5. toughened
6. toughening
7. steel
8. enure
9. inured
10. season
11. temper
12. block
13. cold-drawn
14. endure
15. molybdenum
16. normalize
17. planish
18. annealed
19. anneals
20. armoured
21. callous
22. callus
23. cold chisel
24. enured
25. hard
26. hardened
27. jacket
28. malleable iron
29. nickel
30. obdurate
31. poling
32. stance
33. tempered
34. tough
35. emphasize
36. enhance
37. exacerbate
38. intensify
39. reinforce
40. sharpen

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