No, there's no sense that they happen gradually. They may have been done gradually but also quickly.
Bring about = Cause something to happen Come about = Something happens Go about = Do something or start something Set about = Start something (usually with some kind of determination)
Examples: "Our students are lazy, how can we bring about a change in their
Thanks, but what I meant that it is not sudden. Out of no where. Right? Can you recall any other phrasal verb that is made by "about" and bears another meanings?