Describes something that happens or changes each day. Often used adverbially.
The daily temperature change is large.
He is improving day by day.
day by day; every day; by the day
every day and every night; day after day; daily
Standard mixed kanji-kana spelling; clear and common.
Kanji spelling using 毎; less common but still seen.
A compound of 日, “day,” and the distributive suffix ごと, “each; every,” hence “each day.”