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A "popular press source" in general refers to any news publication, either on paper or online, that has a wide circulation and is popular. Although this doesn't always mean that it is reputable.
Answer:
<em>If someone is not above doing something, they are prepared to do it, even if it is something usually done by someone of a lower status, or even if it is wrong. I'm not above doing <u>my own cleaning.</u> He is not above telling a few white lies. See also: above, not, something.</em>