Verbs

(v)stiffenbecome stiff or stiffer“He stiffened when he saw his boss enter the room”
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(v)stiffenmake stiff or stiffer“Stiffen the cream by adding gelatine”
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(v)stiffen, tighten, tighten up, constrainseverely restrict in scope or extent“tighten the rules”, “stiffen the regulations”
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