First Known Use: 1673
Dictionary
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
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Origin of BILLET-DOUX
French billet doux, literally, sweet letter
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