gradually, monotonously, persistently, each day; see daily, regularly 2.
"day by day." YourDictionary, n.d. Web. 23 June 2018. <http://thesaurus.yourdictionary.com/day-by-day>.
day by day. (n.d.). Retrieved June 23rd, 2018, from http://thesaurus.yourdictionary.com/day-by-day
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