The phrase "trumpet of doom" is often used to describe something ominous or threatening. If you're looking for synonyms for this phrase, there are plenty of options to choose from. One similar phrase is "herald of disaster," which carries a similar connotation of foreboding. Other synonyms include "harbinger of doom," "omen of trouble," and "portent of tragedy." These phrases all evoke a sense of impending danger or trouble, and can be used to describe everything from natural disasters to political upheavals. When you need a powerful way to describe something ominous, these synonyms for "trumpet of doom" can be a great place to start.