billet–doux

noun bil·let–doux \ˌbi-lē-ˈdü, ˌbi-(ˌ)lā-\

plural bil·lets–doux \-ˈdü(z)\

Definition of BILLET-DOUX

: a love letter

See billet-doux defined for kids

French billet doux, literally, sweet letter

First Known Use: 1673

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