blow up是短语动词。

    以下内容摘自《韦氏高阶英汉双解词典》：

    blow up [phrasal verb] 1. blow (something) up or blow up (something):to fill (something) with air or gas : INFLATE （给...）充气 blow up a balloon 吹气球 blow up a tire 给轮胎打气 2. blow up or blow (something) up or blow up (something) a: to explode or to cause(something, such as a bomb) to explode （使）爆炸 The bomb blew up.炸弹爆炸了。 blow up a bomb 引爆炸弹 b:to be destroyed or to destroy (something) by an explosion （被）炸毁 The bridge blew up (in the explosion). 桥被炸毁了。 The soldiers blew up the bridge with a bomb.士兵们用炸弹将桥桥炸毁了。 ...... 

    你的句子：He blew up the bridge.他把桥炸毁了。 

(1)引爆；（使）炸毁；（使）爆炸 (英文解释:If someone blows something up or if it blows up, it is destroyed by an explosion)

He was jailed for 45 years for trying to blow up a plane.

他因为企图炸毁一架飞机而被判入狱 45年。

Their boat blew up as they slept. 

他们睡觉的时候船爆炸了。

(2)给（轮胎）打气；给（气球）充气 (英文解释:If you blow up something such as a balloon or a tyre, you fill it with air)

Other than blowing up a tyre I hadn't done any car maintenance. 

除了给轮胎充气外，我没做过任何汽车保养。

(3)（风、暴风雨）大作 (英文解释:If a wind or a storm blows up, the weather becomes very windy or stormy)

A storm blew up over the mountains. 

山上暴风雨大作。

(4)发怒；大发雷霆 (英文解释:If you blow up at someone, you lose your temper and shout at them)

I'm sorry I blew up at you.

对不起，我对你发脾气了。

When Myra told Karp she'd expose his past, he blew up. 

当迈拉告诉卡普她会把他的过去全抖搂出去时，卡普大为光火。

(5)（使）夸大；（使）言过其实(英文解释: If someone blows an incident up or if it blows up, it is made to seem more serious or important than it really is.)

Newspapers blew up the story.

报纸对此事的报道言过其实了。

The media may be blowing it up out of proportion.

媒体可能过分夸大了此事。

The scandal blew up into a major political furore. 

这个丑闻被渲染成了一场大的政治风波。

(6)放大（照片等）(英文解释: If a photographic image is blown up, a large copy is made of it. )

The image is blown up on a large screen. 

图像被放大在了一个大屏幕上。

two blown up photos of Paddy. 

帕迪的两张放大的照片