Longman Dictionary of Contemporary English homepage

thicken

 verb
     
thick‧en [intransitive and transitive]
to become thick, or make something thick:
The fog was beginning to thicken.
Thicken the soup by adding potatoes.
thicken something with something
a stew thickened with lentils and vegetables

➔ the plot thickens

at plot1 (3)
Definition from the Longman Dictionary of Contemporary English
Advanced Learner's Dictionary.
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