hot² v hotted, hotting hot up phr v [I] especially BrE if something is hotting up, there is a lot of excitement and activity 【尤英】 激烈起来，变活跃: The election campaign is hotting up. 竞选活动正在热烈起来。
hot up especially BrE if something is hotting up, there is a lot of excitement and activity 【尤英】 激烈起来，变活跃: The election campaign is hotting up. 竞选活动正在热烈起来。