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On thin ice to be in a risky situation(»ì¾óÀ½À» ¹â°í; À§ÇèÇÑ »óÅ·Î): If you don't want to find yourself on thin ice, you must be sure of your facts.
On time to be at the scheduled time(½Ã°£À» ¾î±âÁö ¾Ê°í, Á¤°¢¿¡): Our train arrived exactly on time.
On tiptoe to be standing or walking on the front part of the feet(¹ß³¡À¸·Î): She had to stand on tiptoe to reach the top shelf.
On top to be in the lead(¸Ç À§[²À´ë±â]¿¡, ù¹øÂ°¿¡): He was on top of his class when he was in university.
On top of in addition to something, along with something(~¿¡ ´õÇÏ¿©): On top of everything else he wants me to work on Sunday.