Real Dictionary

come up
phrasal verb: If a job comes up or if something comes up for sale, it becomes available.
phrasal verb: If someone comes up or comes up to you, they approach you until they are standing close to you.
phrasal verb: If something comes up in a conversation or meeting, it is mentioned or discussed.
phrasal verb: If something comes up, it happens unexpectedly.
phrasal verb: If something is coming up, it is about to happen or take place.
phrasal verb: In law, when a case comes up, it is heard in a court of law.
phrasal verb: When the sun or moon comes up, it rises.

come up in American English
to arise; begin
to be referred to; arise

come up in British English
to come to a place regarded as higher