also: まえび
noun, adverb
previous day; day before; eve
Refers to the day immediately before a specific event or reference point. Often used in the pattern 〜の前日. Can function as a noun or adverbially.
試験の前日は早く寝たほうがいい。
It's better to go to bed early the day before an exam.
結婚式の前日に
We will hold a rehearsal on the day before the wedding.