Hotting up is a phrase often used to describe situations that are becoming more intense or exciting. There are a number of synonyms that can be used in its place, such as heating up, warming up, or intensifying. Other phrases that convey a similar meaning include becoming more heated, picking up steam, or gaining momentum. The use of these synonyms can add variety to your writing and help to emphasize the increasing intensity of a situation. Whether you are describing a sports match, a political debate, or a workplace conflict, using synonyms for hotting up can help to keep your writing engaging and dynamic.