loom
verb [ I ]
uk/luːm/ usif an unpleasant event looms, it will probably happen and makes people worry:
Stocks of heating oil are at their lowest levels for years, and another crisis may be looming.
The company is in serious financial trouble, with more debt looming on the horizon.
sth looms over sb/sth The threat of closure looms over the workforce.
loom large
if something looms large, it becomes very important and could cause serious problems:
Food retailers became nervous as the threat of a price war loomed large.