Here are the dictionary choices. In your context, it is probably #2 but may be only #1: 1. to appear indistinctly; come into view in indistinct and enlarged form: The mountainous island loomed on the horizon.
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ovvpapatya"This is a signpost. A portent,” Rovender said as he walked around it and pointed to several more LOOMING nearby. What does "looming" mean here?I'd say "rising up indistinctly and dimly, like in a fog, maybe with its lower part obscured, with a vaguely menacing aspect".