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épaissir

to thicken

verb eh-peh-SEER Rare

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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