loom
v. C1 Advanced Oxford US //ˈɫum// UK //lˈuːm// loom
v. to appear as a large, dark, or scary shape, especially when you cannot see it clearly. You also use it to describe a problem that feels like it is coming soon.
v. to appear as a vague, often large or threatening shape; to be about to happen in a way that causes worry. Intransitive — does not take a direct object.
Dark clouds loom over the mountains.
The deadline for the final project began to loom as the weekend approached.
A massive silhouette began to loom through the thick morning fog, eventually revealing itself to be the hull of a rusted cargo ship.
Usage
Intransitive; often followed by prepositions like 'over', 'above', or 'large'.