billet-doux


bil·let–doux

noun \ˌbi-lē-ˈdü, ˌbi-(ˌ)lā-\
plural bil·lets–doux \-ˈdü(z)\

Definition of BILLET-DOUX

:  a love letter

Origin of BILLET-DOUX

French billet doux, literally, sweet letter
First Known Use: 1673

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