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blow up

A2 neutral separable both
In simple words

To explode; to fill something with air; to suddenly become very angry; or for a small problem to become a big one.

Literal meaning: For air or gas to push something upward and outward until it bursts.

Meanings

1 A2 neutral

To explode or to destroy something with an explosion.

"The army used controlled demolition to blow up the old bridge."

Grammar: separable
2 A2 neutral

To fill something with air or gas; to inflate.

"Can you help me blow up the rest of the balloons before the guests arrive?"

Grammar: separable
3 B1 idiomatic informal

To suddenly lose one's temper and become very angry.

"My dad blew up when he found out I'd crashed the car."

4 B2 idiomatic informal

For a situation, argument, or scandal to suddenly become serious or widely known.

"A small disagreement in the comments section blew up into a massive online controversy."

Usage notes

One of the most versatile and frequent phrasal verbs in English. The 'explode' and 'inflate' senses are A2. The 'lose one's temper' sense is very common informally. The 'become a major issue' sense is increasingly common in media and social contexts.

Commonly used with

bomb balloon argument scandal anger photo building

Forms

Base
blow up
I/you/we/they
3rd person
blows up
he/she/it
Past simple
blew up
yesterday
Past participle
blown up
have + pp
-ing form
blowing up
continuous

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Synonyms

explode detonate inflate lose one's temper escalate enlarge

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