From Longman Dictionary of Contemporary Englishmarket dayˈmarket ˌday noun [countable, uncountable] British EnglishDTMC the day in the week when there is a market in a particular town
Examples from the Corpus
market day• Then he had cried one night following a market day in Hexham, for there he had seen two men fighting.• It only takes two or three volunteers on a busy market day or Saturday afternoon to gather several hundred signatures.• It's a Jul fruit market day.• The butter was lowered down on ropes into the cool depths to keep until next market day.• Colgate toothpaste tubes arrives on market day.• It was market day and there were some veterans studying the plant stalls while others studied the pub menu! 