ひ ある日 LinksSentence search for ある日Sentence search for あるひSentence search for 或る日Sentence search for 或日Kanji details for 日Edit in JMdict Expressions (phrases, clauses, etc.), Noun1. one day; (on) a certain dayOther forms或る日 【あるひ】、或日 【あるひ】Notes或日: Irregular okurigana usage. Discussions Log in to talk about this word.