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Know the first thing about, not lack basic knowledge about something(¾Æ¿¹ ¾Æ¹« °Íµµ ¸ð¸¥´Ù): I don't know the first thing about the subject.
Know the ropes experience and know how the system works(¿ä·ÉÀ» Å͵æÇÏ´Ù) I can't do the job because I don't know the ropes.
Know the score know the facts(»çÁ¤À» ¾Ë´Ù; »ç½ÇÀ» ¾Ë°í ÀÖ´Ù; »çÁ¤À» ÀÌÇØÇϰí ÀÖ´Ù): Bob is so naive. He sure doesn't know the score.
Know what's what know the facts about something(¼¼»ó ÀÏÀ» Àß ¾Ë´Ù): She lived a rough live and knows now what's what.
Know when one is not wanted sense when one's presence is not welcome(¾ðÁ¦ ȯ¿µ¹ÞÁö ¸øÇÏ´ÂÁö¸¦ ±ú´Ý´Ù): I know when I am not wanted so I decided not to go to the restaurant.