1. 开始;发生
I'll let him know if anything comes up.
如有什么事,我会告诉他的.
2. 被提出,被讨论
A number of questions came up at the meeting.
会议上提出了许多问题.
3. 走过来
She came up and said, "Glad to meet you."
她走过来说,"很高兴见到你."
4. 开始流行