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Know something backwards and forwards know something very well(¡¦À» ¿ÏÀüÈ÷ ÀÌÇØÇÏ´Ù): Of course I know your situation backwards and forwards.
Know something by heart know something perfectly and from memory(¿Ïº®ÇÏ°Ô ±â¾ïÇϰí ÀÖ´Ù): I know the poem by heart.
Know something from memory know something well from seeing it often(¡¦À» ±â¾ïÇϰí ÀÖ´Ù; ¸î ¹øÀ̳ª º¸¾Æ ¡¦À» Àß ¾Ë°í ÀÖ´Ù): The conductor went through the entire concert without looking down at the music. He knew it from memory.
Know something only too well know something very well(Àß ¾Ë´Ù): I know only too well what will happen if I don't finish my essay on time.
Know something/someone inside out to know something very thoroughly(ÈÍÇÏ°Ô ¾Ë°í ÀÖ´Ù; ¡¦À» ¸ðµÎ ¾Ë°í ÀÖ´Ù; ¡¦¿¡ ´ëÇØ ¿ÏÀüÈ÷ ¾Ë°í ÀÖ´Ù): This is where I grew up. I know this area like the back of my hand.