一いっ昨さく

noun

one previous; the one before last

Rare standalone noun meaning 'the one before last', typically used in temporal expressions such as 一昨年 (the year before last) or 一昨日 (the day before yesterday). In modern Japanese, it is almost always part of a compound rather than used independently.

• 「一いっ昨さく」という語ごは、単たん独どくではほとんど使つかわれず、「一昨おと年とし」や「一昨おと日とい」の形かたちで現あらわれる。

  The word 一昨 is rarely used alone; it appears in forms like 一昨年 (the year before last) and 一昨日 (the day before yesterday).