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One and the same the very same person or thing(´Ù¸§ ¾Æ´Ñ ¹Ù·Î µ¿ÀÏÇÑ »ç¶÷[°Í]): It turns out that her aunt and my cousin are one and the same.
One bad apple a bad person, policy, etc, can ruin everything around it(¾ÏÀûÀÎ Á¸Àç): He is the one bad apple spoils the (whole) barrel.
One by one one at a time, each in turn(ÇϳªÇϳª¾¿[Â÷·ÊÂ÷·Ê]): I went through the items on the list one by one.
One fell swoop in a single period of activity, usually swiftly and ruthlessly(Àϰſ¡; ´Ü¹ø¿¡): When the stock market crashed, many large fortunes were wiped out in one fell swoop.
One foot in the grave near death((³ªÀ̰¡ ¾ÆÁÖ ¸¹°Å³ª À§µ¶ÇÏ¿©) ¿À·¡ ¸ø »ì °Í °°Àº): Her grandmother has one foot in the grave and is not expected to live much longer.