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In on participating in or knowledgeable out(~¿¡ °ü¿©Çϰí ÀÖ´Ù/°ü¿©ÇÏ°Ô µÇ´Ù; ~¿¡ ´ëÇØ ¾Ë´Ù[°øÀ¯ÇÏ´Ù]): I'd like to be in on the plan.
In one ear and out the other forget it as soon as you've heard it because it was too complicated, boring etc(ÇÑÂÊ ±Í·Î µé¾î°¬´Ù ´Ù¸¥ ÂÊ ±Í·Î ³ª°¡´Ù): Everything I tell them just goes in one ear and out the other.
In one fell swoop as a single incident or event(Àϰſ¡; ´Ü¹ø¿¡): When the stock market crashed, many large fortunes were wiped out in one fell swoop
In one's (own) backyard very close to someone(°¡±îÀÌ¿¡¼): The school is in his own backyard.
In one's birthday suit naked, nude(¾Ë¸öÀ¸·Î): A man is going about in his birthday suit.