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| stiff·en [ stíffən ] (past and past participle stiff·ened, present participle stiff·en·ing, 3rd person present singular stiff·ens) |
transitive and intransitive verb |
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1. become inflexible: to become rigid or inflexible, or make something do this
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2. strengthen something: to make something stronger or more effective, or become stronger or more effective
 Lawmakers decided to stiffen the penalties for noncompliance with the new statute.
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| stiff·en·er noun |
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