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