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slang To peruse or frequent an online community, such as a forum, message board, or comment section, without leaving a comment or post of one's own. I've been lurking on this site since the early 2000s, but recently I've felt motivated to contribute some of my own writing. There are a vocal minority on here who will shout down dissenting opinions, but I think most of the people lurking on our site are actually pretty tolerant and reasonable.
To move or hang about (some place) in a suspicious, sneaking, or slinking manner. I had this horrible feeling someone was lurking around outside our house, so I called the police. This is the second time this month I've seen that guy lurking around—does anyone know who he is?
to slink or sneak around somewhere. Who is that guy lurking around the building? Stop lurking around.
in. to read computer newsgroups or forums without ever making a comment. I’ve been lurking for a few weeks but just have to get in a few comments.