Vocabulary What does 日増しに (ひましに, himashini) mean? 日増しに (ひましに, himashini) means day by day. Quick factsReadingひましにRomajihimashiniPart of speechadverb 日増しにひましにhimashiniday by day1adverb day by dayKanji in this word日day; sun増increase, add