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Elementary Dictionary
       

blow up

 
part of speech: phrase
definition 1: When something blows up, it suddenly breaks apart with a lot of force.
The top of the mountain blew up and lots of rock went high into the air. Before that, we didn't even know the mountain was a volcano.
synonyms:
explode
similar words:
destroy
definition 2: When you blow up something, you fill it with air or gas.
It's time to blow up the balloons for the party!
synonyms:
inflate