晦かい朔さく

noun

last and first days of the month

Archaic term referring to the last day of the lunar month (晦) and the first day of the next month (朔). Used in classical or historical contexts.

• 古ふるい暦こよみの説せつ明めいで「晦かい朔さく」という言こと葉ばが出でてきた。