STIFFEN
Definition:
- [verb] become stiff or stiffer; "He stiffened when he saw his boss enter the room"
- [verb] make stiff or stiffer; "Stiffen the cream by adding gelatine"
- [verb] restrict; "Tighten the rules"; "stiffen the regulations"
Synonyms: tighten, tighten up, constrain
Synonyms:
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