Synonyms of day by day in English:

day by day


See definition of day by day

phrase

1‘day by day they were being forced to retreat’

SYNONYMS
gradually, bit by bit, by degrees, by stages, inchmeal, inch by inch, little by little, step by step, slowly, slowly but surely, steadily, progressively
ANTONYMS

all at once

2‘the sort of life they led day by day in their homes’

SYNONYMS
daily, every day, day after day, a day at a time
rare diurnally