Something has come up.

This is a common phrase that English speakers use when breaking an appointment, a date, etc. For example:

I'm so sorry, but something has come up. Can we reschedule for next week instead?

"Something has come up" means that something very important has happened which you need to deal with instead of keeping your original appointment. You say this when you don't want to explain exactly what the situation is.

This phrase appears in these lessons: