harden
verb
[ ˈhɑːd(ə)n ]
• make or become hard or harder.
• "wait for the glue to harden"
Similar:
solidify,
set,
become hard,
become solid,
congeal,
clot,
coagulate,
stiffen,
thicken,
cake,
freeze,
bake,
crystallize,
strengthen,
reinforce,
anneal,
vulcanize,
ossify,
petrify,
indurate,
inspissate,
gelatinize,
