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

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

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

4. 发怒；大发雷霆
If you blow up at someone, you lose your temper and shout at them.

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

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

7. see also: blow-up