一いっ昨さく晩ばん

い

っ

さ

く

ば

ん

Meanings

1

noun, adverb

night before last

Refers to the night of the day before yesterday. Often used adverbially as 一昨晩に.

一いっ昨さく日じつ
Means 'the day before yesterday', while 一昨晩 specifically refers to the night of that day.
昨さく晩ばん
Means 'last night', one night more recent than 一昨晩.

Compound of 一昨 (いっさく, 'the one before last') and 晩 (ばん, 'night'). The reading いっさく is a phonetic shift from 一昨 (いっさく).