In October 1871 dry weather and an abundance of wooden buildings, streets and sidewalks made Chicago vulnerable to fire. Since this happened it was a cause to to start a fire instantly. It was started in Catherine O Learys Barn.
It signifies a story that began sadly but ended happily
Wicked. Because of obscene means offensive or disgusting, one infer that because it means those things it would also be a word to describe evil things. Thus wicked is the closest answer to the actual word.
