Usage Note
Décolleté is both a noun (un décolleté plongeant — a plunging neckline) and an adjective (une robe décolletée — a low-cut dress). The word comes from the verb décolleter (to cut the neckline of a garment). In fashion French, the shape is further specified: décolleté en V, décolleté carré, décolleté bateau.
Examples
"Sa robe avait un décolleté élégant."
Natural Translation
Her dress had an elegant neckline.

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