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A courtship visit in which the couple sit together by candlelight; courtship.
Late 19th century. From opsit.
Of a couple: to sit up together at night as a recognized part of courtship.
An Afrikaner (originally Dutch) courtship custom. The couple would sit by candlelight, for a period determined by the length of the candle provided by the courted woman's family.
Late 19th century. From Afrikaans opsit from South African Dutch opzit from Dutch opzitten to sit up from op- + zitten.