大昔 おおむかし Meanings Noun, Adverb ancient times; prehistoric times; the distant past; a very long time ago Kanji 大 big. Read as おお. 昔 long ago. Read as むかし. Example sentences あの城は大昔の時代に建てられた。That castle was built in ancient times. 大昔、たいていの人々は季節の変化に応じて移動する集団の中で暮らしていた。A long time ago, most people lived in groups that moved around as the seasons changed. 恐竜は大昔に絶滅した。Dinosaurs became extinct a very long time ago. Jinuma: Japanese Dictionary · Word lists