黄おう道どう吉きち日にち

also: こうどうきちにち

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Meanings

1

very auspicious day for all occasions

yojijukugo (four-character idiom)

A yojijukugo used in traditional contexts to refer to an exceptionally lucky day suitable for any important event, such as weddings, openings, or travel.

結けっ婚こん式しきは黄おう道どう吉きち日にちを選えらんで行おこなうと縁えん起ぎが良よいとされています。
It is said that holding a wedding on a very auspicious day brings good luck.