any material used to thicken; "starch is used in cooking as a thickening" 同義詞:thickener,
accumulating and becoming more intense; "the deepening gloom"; "felt a deepening love"; "the thickening dusk" 同義詞:deepening,
becoming more intricate or complex; "a thickening plot"
百科解釋
In cooking, thickening is the process of increasing the viscosity of a liquid either by reduction, or by the addition of a thickening agent, typically containing starch.