blowˈhard noun

A boastful person (also adjective)

blowˈhole noun

1. A whale's nostril
2. A hole in ice to which seals, etc come to breathe
3. A vent for escape of gas, etc
4. A bubble in metal
5. A natural vent from the roof of a cave up to the ground surface, through which air and water are forced by rising tides

blowˈ-in noun (chiefly Aust informal)

A recent arrival, newcomer

blowˈjob noun (slang)

An act of fellatio

blowˈlamp noun

A portable lamp producing a jet of very hot flame

blowˈ-moulding noun

A process used in manufacturing plastic objects, the molten thermoplastic being blown against the sides of the mould

blowˈ-off see blow off below.

blowˈ-out noun

1. A lavish meal or entertainment (slang)
2. A tyre-burst (informal)
3. A violent escape of oil and gas from an oil well

blow-out preventer noun

A stack of heavy-duty valves fitted in the wellhead of an oil well to prevent blow-outs

blowˈpipe noun

1. A pipe through which air is blown onto a flame, to increase its heat, used in blowpipe analysis, etc
2. A long straight tube from which an arrow, pellet, etc is blown by the breath
3. A glass-blower's tube

blowˈtorch noun (N American)

A blowlamp

blowˈ-up noun

1. An explosion
2. An enlargement of (part of) a photograph, illustration, etc

adjective

Inflatable

blowˈ-valve noun

A snifting-valve

blow away (slang)

1. To kill, murder
2. To surprise or excite
3. To disprove (a theory, etc)

blow a well (mining)

Temporarily to remove pressure at a wellhead to allow tubings and casings to be blown free of debris, water, etc

blow hot and cold

To be favourable and unfavourable by turns, to be irresolute

blow in

To turn up unexpectedly

blow off

1. To allow (steam, etc) to escape
2. (of steam, etc) to escape forcibly
3. To break wind from the anus (informal)
4. To fail to keep an appointment (with; informal) (blow-off noun and adjective)

blow on or upon

1. To take the bloom, freshness, or the interest off
2. To bring into discredit
3. To inform upon

blow one's (or someone's) mind (slang)

To go (or cause to go) into a state of ecstasy under the influence of a drug or of an exhilarating experience

blow one's stack or top (informal)

To explode in anger

blow out

1. To extinguish by blowing
2. To become extinguished
3. To force outwards by an explosion
4. (of a tyre) to burst suddenly (informal)
5. (of an oil well) to emit an uncontrolled jet of oil and gas
6. To fail to keep an appointment with (someone) (informal)

blow over

To pass away or die down, as a storm, a danger or a scandal

blow (someone's or) one's brains out (informal)

To kill (someone or) oneself by shooting (him or her or) oneself in the head

blow someone's cover (informal)

To reveal someone's identity

blow the whistle on (informal)

1. To inform on (a person)
2. To expose (an illegal practice, etc)

blow up

1. To come suddenly into prominence
2. To destroy by explosion
3. To explode
4. To finish in disaster
5. To inflate (lit and figurative)
6. To scold
7. To lose one's temper
8. To enlarge (eg an illustration)
9. To go to pieces (US sl)

blow upon see blow on above.