expression, noun

Archaism.
  1. day of the Snake.

Variations

Pronunciation Kanji Kana Is Common
 
巳の日 みのひ

Contained Kanji Breakdown

sign of the snake or serpent, 9-11AM, sixth sign of Chinese zodiac
み シ (Kentei Pre-1, N1)
self
コ おのれ キ (6th, N1)
day, sun, Japan
ひ にっ ニチ (1st, N5)