1. thicken, inspissate, change, alter, modify

usage: make thick or thicker; "Thicken the sauce"; "inspissate the tar so that it becomes pitch"

2. thicken, inspissate, change state, turn

usage: become thick or thicker; "The sauce thickened"; "The egg yolk will inspissate"

3. thicken, inspissate, change integrity

usage: make viscous or dense; "thicken the sauce by adding flour"

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See also: thicken (Dictionary)