Also means
to become thick
Usage Note
Épaissir is used both transitively (épaissir une sauce — to thicken a sauce) and intransitively (la sauce épaissit — the sauce is thickening). The noun l'épaisseur means thickness, and the adjective épais (thick) is its root. In cooking, common thickeners include fécule de maïs (cornstarch) and farine (flour).
Examples
"Laisse la sauce épaissir à feu doux."
Natural Translation
Let the sauce thicken over low heat.
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