One of the mysteries of the English language finally explained.
Beauty that is associated with youth; especially transient and superficial attractiveness and charm, often associated with a mischievous or rakish personality.
Early 19th century; earliest use found in Harriette Wilson (1786–1845), courtesan. From French beauté du diable, lit. ‘devil's beauty’ from beauté + du of the + diable.
beauté du diable/bəʊˌteɪ duː dɪˈɑːbl(ə)/
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