1. day by day - Adverb
2. day by day - Adjective Satellite
of or belonging to or occurring every day
gradually and progressively
Source: WordNetday-by-day
daily routine Source: Internet
a daily paper Source: Internet
his health weakened day by day Source: Internet
As of now, the rock music scene in India is quietly growing day by day and gathering more support. Source: Internet
Fauci, the nation's top infectious-diseases expert, told CNN that the timeline for reopening the country would be informed by a team that has been reviewing data day-by-day and presenting that information to the president. Source: Internet
Falkner: Blenheim 1704, p. 18 Prelude Protagonists march to the Danube :A scarlet caterpillar, upon which all eyes were at once fixed, began to crawl steadfastly day by day across the map of Europe, dragging the whole war with it. Source: Internet