stiffen
(verb)
verb
1. become stiff or stiffer
- He stiffened when he saw his boss enter the room
Definition categories: change
2. make stiff or stiffer
- Stiffen the cream by adding gelatine
Definition categories: change, alter, modify
3. severely restrict in scope or extent
- stiffen the regulations
Similar word(s): constrain, tighten
Definition categories: change, bound, confine, limit, restrict, throttle, trammel