当あたり日び

noun

day something happens; day one encounters something

Refers to a day when a particular event occurs or when one happens to come across something. Often used in contexts like lucky days or days of occurrence.

• 今日きょうは宝たからくじの当あたり日びだ。

  Today is the lottery drawing day.

• 彼かれに会あえたのは本ほん当とうに当あたり日びだった。

  It was truly a lucky day to run into him.