One of the mysteries of the English language finally explained.
The action or fact of copulating back to back (as is a normal stage of mating in dogs, and was formerly supposed to occur in retromingent mammals). Later also: the action of copulating from behind (i.e. with the male behind the female, as in most mammals).
Mid 17th century; earliest use found in Thomas Browne (1605–1682), physician and author. From retro- + copulation.
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