Answer: thicken

AnswerCrossword Clue
THICKENWhat the plot may do
THICKENWhat plots may do
THICKENGrow more profound, as a plot
THICKENGet complicated, as a plot
THICKENGet set?
THICKENWhat a plot may do
THICKENUse roux
THICKENSet
THICKENAdd cornstarch to
thickento make thick (viscous (having relatively high resistance to flow))
thickenMake or become thick or thicker