thicken
verb
[ ˈθɪk(ə)n ]
• make or become thick or thicker.
• "thicken the sauce with flour"
Similar:
become thick/thicker,
stiffen,
become firmer,
condense,
become more concentrated,
solidify,
set,
gel,
congeal,
clot,
coagulate,
cake,
inspissate,
gelatinize,
