You mean as a verb. Something ominous or unpleasant might be described as looming. "Black clouds loomed on the horizon." "The deadline for the term paper is looming."

As Peachey wrote, it's important to provide a context. Two things come to mind when you say "loom": 1) a weaving loom, and 2) something that is approaching or very near which is big and scary, such as a looming deadline. ^_^

As a noun it is a machine on which we turn thread to cloth As a verb I can say that if something looms or looms up (from somewhere, out of something), you can feel it either through your sight (eyes) or ears or even through you mind. * As the day of my interview loomed, I became increasingly nervous. Here you feel the approaching interview through your mind. * When we turned at the fork, a giant bear loomed in front of us. Here you see something which has suddenly appeared in front of you (sight) And here are some words which are commonly used with Loom as a verb: Skyscraper: having existed the airport, skyscrapers of N.Y loomed from everywhere She started to walk faster when a dark shadow loomed from her behind. Disaster, crisis, cloud, ......

Give us an example sentence please. :)