Letters that make day-by-day
a, b, d, y are letters that make 'day-by-day'
1 possible definitions for 'day-by-day'
Under this definition, day-by-day is an adjective and has the following properties:
daily, day-to-day, day-after-day have the same meaning as 'day-by-day'
twenty-four hours, twenty-four hour period, 24-hour interval, solar day, mean solar day, day are derivatives of 'day-by-day'.
periodic, periodical are similar to 'day-by-day'.