市いちが立たつ日ひMeanings1expression, nounmarket dayA fixed phrase referring to the day on which a regular market is held, often in a specific town or area.この町まちでは、毎まい月つき五いつ日かと二十はつ日かが市いちが立たつ日ひです。In this town, the 5th and 20th of every month are market days.