いちにちいちにち
一日一日
gradually; day by day
N3Adverb
Adverb, Adverb (to particle)
gradually•day by day
Noun
every day•each day
Example Sentences
一日一日と寒くなってきた。
It is getting colder and colder day by day.
一日一日が歴史の１ページである。
Every day of thy life is a page in thy history.