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