One of the mysteries of the English language finally explained.
In Japan and Hong Kong: a form of paid escort work in which a young woman provides companionship or sexual favours to an older man in exchange for money or luxury items.
1990s; earliest use found in The Observer. From Japanese enjo kōsai from enjo assistance, financial support + kōsai fellowship, companionship, dating.
enjo kosai/ˌɛndʒəʊ ˈkəʊsʌɪ/
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