WordNet
billet doux
n. a personal letter to a loved one expressing affection [syn: love letter]
Usage examples of "billet doux".
But remember, I am not an English woman, and I do not look upon the exchanging of BILLET DOUX as a crime, and I vow I’.
Another billet doux was found in the biscuit tin in the larder, 'To my so-called wife.