Sorry, no online dictionaries contain the exact phrase becomes tougher.
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Reverse dictionary results:
1. harden
2. hardened
3. toughen
4. toughened
5. adaptation
6. age
7. ageing
8. alternative
9. baking
10. became
11. become
12. bond
13. contract
14. crystallization
15. degeneration
16. fester
17. festering
18. grower
19. inversion
20. mugger
21. run
22. runs
23. security
24. sentential function
25. shame
26. swordfish
27. top
28. topped
29. tops
30. worsening
31. ambiance
32. chokebore
33. lignification
34. above
35. abrade
36. accelerate
37. accelerated
38. accelerates
39. accelerating
40. accumulate

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