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hardenability▼noun
tighten [tightened, tightening, tightens]▼verb[UK: ˈtaɪt.n̩] [US: ˈtaɪt.n̩]
tighten up▼verb
toughen [toughened, toughening, toughens]▼verb[UK: ˈtʌf.n̩] [US: ˈtʌf.n̩]
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