day by day

Adverb

one day at a time / gradually

Japanese Meaning

一日一日順々に / 日々少しずつ / 徐々に

After the accident, she recovered day by day, regaining strength and confidence.

事故の後、彼女は一日ずつ回復し、体力と自信を取り戻しました。

Sense（1）

one day at a time

He tore the page for Thursday from his day by day calendar.

Sense（2）

gradually

Day by day things got worse.

more day by day

（ comparative ）

most day by day

（ superlative ）