ころ
approximate time
Not the date, and nobody is asking for the date. The stretch of years when you were small enough to be in that park every single day, collar ころ always filthy: ころ.
子供の頃 is when I was a child. After a word it softens to ごろ: 三時頃 さんじごろ, around three.
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Emaki is not affiliated with, or endorsed by, Kaishi 1.5k or its authors. The word, reading and meaning come from the Kaishi 1.5k deck, used with their permission. The mnemonic, the note and the kanji breakdown are original work, published under CC BY-SA 4.0.