Meaning of “loom” - Learner’s Dictionary

loom

verb [ I ] uk us /luːm/
APPEAR

to appear as a large, sometimes frightening shape:

Dark storm clouds loomed on the horizon.
WORRY

If an unpleasant event looms, it is likely to happen soon:

The threat of closure looms over the workforce.

(Definition of “loom verb” from the Cambridge Learner’s Dictionary © Cambridge University Press)