← BackshareGuessday by day/ˈdeɪ baɪ ˈdeɪ/adverbGradually or slowly over a period of time, one day at a time.We are learning the language day-by-day, without rushing.Her health improved day-by-day after the surgery.The project progressed day-by-day, with small but steady changes.Synonymsgraduallyslowly