up
1.
to destroy sth by an explosion :
The police station was blown up by terrorists.
➡ note at explode
2.
to fill sth with air or gas so that it becomes firm :
The tyres on my bike need blowing up.
3.
to make a photograph bigger
SYN enlarge
—related noun blow-up
4.
to make sth seem more important, better, worse, etc. than it really is :
The whole affair was blown up out of all proportion .