Billet-doux
/ˌbɪleɪ ˈduː/
Definition 1 of 1
Pro Tip 1/3Historical Charm
Billet-doux has a vintage feel, often used to invoke romantic nostalgia. 
Her grandmother's attic was filled with old billet-doux, tied with ribbons.
Pro Tip 2/3French Origin
Billet-doux is a French phrase meaning 'sweet note', reflecting its romantic nature. 
In his finest handwriting, he penned a billet-doux to impress her.
Pro Tip 3/3Literary Use
Often used in literature to add a touch of elegance or historical context to romantic correspondence. 
The novel's hero sent a passionate billet-doux that spelled out his undying love.
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