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the other day; lately; recently
こないだ街で高校時代の友達に偶然会ったよ。
I happened to meet a friend the other day.
こないだ買った本がとても面白い。
The book I bought the other day is very interesting.
そういえばこないだの話の続きをしようか。
Let us continue the conversation from the other day.