1. be on somebody; If something such as drinks, food, tickets, etc. are on somebody,
they are paid by that person.
The drinks are on me. 내가 낼게.
Oh, really? I won't turn it down. Thanks. 거절하지 않을게. 고마워.
2. It is all Greek to me; It is difficult for me to understand.
I don't understand my professor's explanation. It's all Greek to me.
3. stick around; to stay in or near a place, waiting for something or somebody.
I'll stick around here. (여기서 기다릴게)
4. in a flash; very quickly, suddenly
The vacation was gone in a flash.(휴가가 눈 깜짝할 사이 지나갔다)
5. drive someone up the wall; to make someone very angry.
The noise from next door is driving me up the wall.