Etymology
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thicken (v.)

late 14c. (transitive), 1590s (intransitive), from thick + -en (1). Related: Thickened; thickening. An earlier verb was Middle English thick, Old English þiccian "to thicken, to crowd together."

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Definitions of thicken

thicken (v.)
make thick or thicker;
Synonyms: inspissate
thicken (v.)
become thick or thicker;
The sauce thickened
Synonyms: inspissate
thicken (v.)
make viscous or dense;
thicken the sauce by adding flour
Synonyms: inspissate
From wordnet.princeton.edu