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1. A writer or journalist who keeps an advice column in a newspaper to answer readers' problems or quandaries. Collins worked as a sob sister for her local newspaper for several years before moving on to a permanent position with the New York Times.
2. A writer or journalist who focuses on or specializes in overly emotional, dramatic, or sentimental. They hired me as a sob sister to write about the plights of those in need of charity around the city.
3. A girl or woman who is prone to overly emotional pleas, complaints, or outbursts. It's a very difficult and narrow path to tread as a woman in the business world. If you show any emotional vulnerability, you are considered a sob sister, but if you allow nothing to show through, you're seen as some stuck-up ice queen—there's just very little in the way of a middle ground. There's this sob sister in my group who just drains all my energy with her constant complaining and whining.
n. a weak woman who is prone to crying. I had another sob sister in the office today. Went through half a box of tissues.
Someone devoted to charities, or (less charitably) a do-gooder. Originally a newspaper reporter or editor, invariably a woman, whose assignment was to produce sentimental stories and interviews that would appeal to female readers. By extension, the phrase came to mean any overly emotional person, whether male or female, especially one involved in charitable and public service efforts where sad tales of the recipients would tug on their heartstrings.