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roughen [roughened, roughening, roughens]▼◼◼◼verb[UK: ˈrʌf.n̩] [US: ˈrʌf.n̩]
toughen [toughened, toughening, toughens]▼◼◼◻verb[UK: ˈtʌf.n̩] [US: ˈtʌf.n̩]
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