stiffen
verb
[ ˈstɪf(ə)n ]
• make or become stiff or rigid.
• "he stiffened his knees in an effort to prevent them trembling"
Similar:
become stiff,
thicken,
set,
become solid,
solidify,
harden,
gel,
congeal,
coagulate,
clot,
make/become stiff/rigid,
tense (up),
tighten,
tauten,
rigidify,
ankylose,
