ひひ 日に日に Common word LinksSentence search for 日に日にSentence search for ひにひにKanji details for 日Edit in JMdict Adverb (fukushi)1. day by day; by the dayかんじゃ患者はひにひ日に日によくなっていった。The patient was recovering daily.Adverb (fukushi)2. daily; every dayArchaic Discussions Log in to talk about this word.