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to fold up; to fold into layers
to collapse (content on a webpage, etc.)
地図を使い終わって折り畳んだ。
I finished using the map and folded it up.
テーブルを折り畳んでいるとき椅子にぶつかった。
I bumped into a chair while folding up the table.
折り畳む椅子は旅行先で重宝する。
A folding chair comes in very handy when traveling.