"thickens" in the verb sense
1. thicken, inspissate
make thick or thicker
"Thicken the sauce"
"inspissate the tar so that it becomes pitch"
2. thicken, inspissate
become thick or thicker
"The sauce thickened"
"The egg yolk will inspissate"
3. thicken, inspissate
make viscous or dense
"thicken the sauce by adding flour"
Source: WordNet® (An amazing lexical database of English)
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