noun
very unlucky day (old almanacs)
Archaic term referring to a day considered extremely inauspicious in traditional calendar systems. Modern Japanese typically uses 仏滅 (ぶつめつ) for the same concept.
See also: 仏滅
昔の暦では、仏滅日には婚礼を避けたという。
In old calendars, they say weddings were avoided on very unlucky days.
Modern equivalent; 仏滅日 is an archaic, longer form rarely used today.
Compound of 仏滅 (ぶつめつ, 'Buddha's death', a very unlucky day in the six-day cycle) and 日 (にち, 'day'). The exact historical derivation is uncertain, but the term follows the pattern of naming days in traditional almanacs.