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stiffen [stiffened, stiffening, stiffens]▼(to become stiff)verb[UK: ˈstɪf.n̩] [US: ˈstɪf.n̩]
toughen [toughened, toughening, toughens]▼(to become tougher)verb[UK: ˈtʌf.n̩] [US: ˈtʌf.n̩]
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