1. [intransitive, transitive] to send out air from the mouth
+ adv./prep. You're not blowing hard enough!
The policeman asked me to blow into the breathalyser.
blow something + adv./prep. He drew on his cigarette and blew out a stream of smoke.
2. [intransitive, transitive] when the wind or a current of air blows, it is moving; when it blows, the wind is blowing
The birds were singing and a warm wind was blowing.
+ adv./prep. A cold wind blew from the east.
It was blowing hard.
It was blowing a gale (= there was a strong wind).
3. [intransitive, transitive] to be moved by the wind, somebody’s breath, etc.; to move something in this way
+ adv./prep. My hat blew off.
+ adj. The door blew open.
blow somebody/something + adv./prep. I was almost blown over by the wind.
She blew the dust off the book.
The ship was blown onto the rocks.
The bomb blast blew two passers-by across the street.
blow something + adj. The wind blew the door shut.
4. [transitive, intransitive] if you blow a whistle, musical instrument, etc. or if a whistle, etc. blows, you produce a sound by blowing into the whistle, etc.
the sound of trumpets blowing
blow something The referee blew his whistle.
5. transitive] blow your nose to clear your nose by blowing strongly through it into a tissue or handkerchief
She grabbed a tissue and loudly blew her nose.
6. [transitive] blow (somebody) a kiss to kiss your hand and then pretend to blow the kiss towards somebody
7. [transitive] blow something to make or shape something by blowing
to blow smoke rings
to blow bubbles (= for example, by blowing onto a thin layer of water mixed with soap)
to blow glass (= to send a current of air into melted glass to shape it)
8. [intransitive, transitive] blow (something) if a fuse blows or you blow a fuse, the electricity stops flowing suddenly because the fuse (= a thin wire) has melted because the current was too strong
9. [intransitive, transitive] to break open or apart, especially because of pressure from inside; to make a tyre break in this way
The car spun out of control when a tyre blew.
The truck blew a tyre and lurched off the road.
10.[transitive] blow something to break something open with explosives
The safe had been blown by the thieves.
11. [transitive] blow something (informal) to make known something that was secret
One mistake could blow your cover (= make your real name, job, intentions, etc. known).
We’re going to blow his operation wide open.
12. [transitive] blow something (on something) (informal) to spend or waste a lot of money on something
He inherited over a million dollars and blew it all on drink and gambling.
13. [transitive] blow something (informal) to waste an opportunity
She blew her chances by arriving late for the interview.
You had your chance and you blew it.
14. transitive]
In this meaning blowed is used for the past participle.
blow somebody/something (British English, informal) used to show that you are annoyed, surprised or do not care about something
Blow it! We've missed the bus.
Well, blow me down! I never thought I'd see you again.
I'm blowed if I'm going to (= I certainly will not) let him treat you like that.
Let's take a taxi and blow (= never mind) the expense.
15. [transitive, intransitive] blow (something) (North American English, informal) to leave a place suddenly
Let's blow this joint.