日に日に

Etymology
From.

Literally “on the day on the day”, with particle indicating time or location.

Adverb

 * 1) day by day, gradually
 * 2) every day
 * 1) every day
 * 1) every day

Etymology
Literally “on the day on the day” or “day by day”, with particle indicating time or location.

Adverb

 * 1) every day