The rising action in "The Story Of An Hour" is that, when it was time to break the news of Mr. Mallard's death to Mrs. Mallard as she was afflicted with a heart trouble.
The term "rising" means the act or process of a person or thing that is growing in rank, status, level, etc.
The term "afflicted" means to cause pain or suffering to someone.
The term "trouble" means a condition of mental distress, anxiety or unrest. Trouble also means difficulties.
It wasn't easy to break the news of Mr. Mallard's death to Mrs. Mallard as she was afflicted with heart troubles, and from this point onwards the story get it's theme and exposure to emotions, feelings, and life turning points.
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