One of the mysteries of the English language finally explained.
A dress stained green from rolling in grass. Chiefly in "to give a woman a green gown": to engage in amorous play with a woman; (euphemism) to deflower, deprive a woman of her virginity.
Late 16th century; earliest use found in Philip Sidney (1554–1586), author and courtier. From green + gown.
green gown/ˌɡriːn ˈɡaʊn/
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