一昨昨 いっさくさく Also written 一昨々 Meanings Prefix three (days, years, etc.) ago; two ... before last See also: 一昨昨日 (いっさくさくじつ). Kanji 一 one. Read as イチ. 昨 yesterday. Read as サク. Words containing 一昨昨 一昨昨日 (いっさくさくじつ) two days before yesterday Jinuma: Japanese Dictionary · Word lists