百日天下 ひゃくにちてんか Meanings Noun very short-lived regime; very brief reign (literally: (Napoleon's post-Elba) Hundred Days) Kanji 百 hundred. Read as ヒャク. 日 day. Read as ニチ. 天 heaven. Read as テン. 下 down. Read as カ. Jinuma: Japanese Dictionary · Word lists