1. 加热：hot temper 急躁的脾气 | hot up 加热 | hot water 热水

2. 热门置顶：head-hot 头条热门 | hot-up 热门置顶 | commend-hot 推荐热门

1. 加剧;变得活跃;变得激烈
    When something hots up, it becomes more active or exciting.

    e.g. The bars rarely hot up before 1am...
           酒吧在午夜一点前通常都很冷清。
    e.g. Campaigning is expected to start hotting up today.
           预计竞选活动从今天开始会日益激烈。

verb

1. make more powerful

    e.g. he souped up the old cars

    Synonym: soup uphop up

2. make more intense

    e.g. Emotions were screwed up

    Synonym: heat upscrew up

3. gain heat or get hot

    e.g. The room heated up quickly

    Synonym: heatheat up