hot up (obj) hot (obj) up HhBt, $hB:t v adv 加剧 A few days before the elections, the pace began to hot up (= to become faster and more exciting). [I] 选举前几天，竞争开始加剧。 If you hot up a car's engine, you change it so that the car will go faster. [M] 为汽车换装大功率发动机