いちにちいちにち
gradually; day by day; every day; each day
Adverb, Adverb (-to)
Noun
一日一日いちにちいちにちと寒さむくなってきた。
It is getting colder and colder day by day.
一日一日いちにちいちにちが歴史の１ページれきしのいちぺーじである。
Every day of thy life is a page in thy history.