a national holiday in Japan on the birthday of the 今上天皇 (Kinjō Tennō, “present reigning emperor”), currently February 23

五日 (itsuka, go-nichi, “fifth (5th) day”) / 十日 (tōka, jū-nichi, “tenth (10th) day”) / 十五日 (jūgo-nichi, “fifteenth (15th) day”) / 二十日 (hatsuka, nijū-nichi, “twentieth (20th) day”)

fifty days / Short for 五十日の祝 (ika no iwai): a Heian-period celebration on the 50th day after a child's birth / Short for 五十日の餅 (ika no mochii): mochi fed to the child during ika no iwai

the forty-ninth day after a person dies / the Buddhist memorial service that occurs forty-nine days after a person dies

the forty-ninth day after a person dies / the Buddhist memorial service that occurs forty-nine days after a person dies

Alternative spelling of 二十日鼠 (“house mouse”)

short for 禍津日神 (magatsuhi no kami, “gods of misfortune”).

a male given name

(idiomatic) someone who cannot stick to anything, someone who gives up easily

dated the eighth