| blow | (noun) a powerful stroke with the fist or a weapon | - |
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| (noun) forceful exhalation through the nose or mouth | Synonyms: puff |
| (noun) street names for cocaine | Synonyms: C, coke, nose candy, snow |
| (noun) an impact (as from a collision) | Synonyms: bump |
| (noun) an unpleasant or disappointing surprise | Synonyms: shock |
| (noun) an unfortunate happening that hinders or impedes; something that is thwarting or frustrating | Synonyms: black eye, reversal, reverse, setback |
| (noun) a strong current of air | Synonyms: blast, gust |
| blowback | (noun) Blowback is a system of operation for self-loading firearms that obtains energy from the motion of the cartridge case as it is pushed to the rear by expanding gases created by the ignition of the propellant charge. | - |
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| (noun) misinformation resulting from the recirculation into the source country of disinformation previously planted abroad by that country's intelligence service | - |
| (noun) the backward escape of gases and unburned gunpowder after a gun is fired | Synonyms: backfire |
| blowball | (noun) any of several herbs of the genus Taraxacum having long tap roots and deeply notched leaves and bright yellow flowers followed by fluffy seed balls | Synonyms: dandelion |
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| blowbang | (noun) A sexual activity where fellatio is performed on multiple men | - |
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| blower | (noun) large aquatic carnivorous mammal with fin-like forelimbs no hind limbs, including: whales, dolphins, porpoises, narwhals | Synonyms: cetacean, cetacean mammal |
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| (noun) a device that produces a current of air | - |
| (noun) a fan run by an electric motor | Synonyms: electric fan |
| blowfish | (noun) any of numerous marine fishes whose elongated spiny body can inflate itself with water or air to form a globe; several species contain a potent nerve poison; closely related to spiny puffers | Synonyms: globefish, puffer, pufferfish |
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| (noun) delicacy that is highly dangerous because of a potent nerve poison in ovaries and liver | Synonyms: puffer, pufferfish, sea squab |
| blowfly | (noun) large usually hairy metallic blue or green fly; lays eggs in carrion or dung or wounds | Synonyms: blow fly |
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| blowgun | (noun) a tube through which darts can be shot by blowing | Synonyms: blow tube, blowpipe, blowtube |
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| blowhard | (noun) a very boastful and talkative person | Synonyms: boaster, braggart, bragger, line-shooter, vaunter |
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| blowhole | (noun) a hole for the escape of gas or air | Synonyms: vent-hole, vent, venthole |
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| (noun) the spiracle of a cetacean located far back on the skull | - |
| blowing | (noun) processing that involves blowing a gas | - |
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| blowjob | (noun) slang for fellatio | Synonyms: cock sucking |
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| blowlamp | (noun) a burner that mixes air and gas to produce a very hot flame | Synonyms: blowtorch, torch |
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| blowout | (noun) a gay festivity | Synonyms: gala, gala affair, jamboree |
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| (noun) a sudden malfunction of a part or apparatus | - |
| (noun) an easy victory | Synonyms: laugher, romp, runaway, shoo-in, walkaway |
| blowpipe | (noun) a tube that directs air or gas into a flame to concentrate heat | Synonyms: blow tube, blowtube |
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| (noun) a tube through which darts can be shot by blowing | Synonyms: blow tube, blowgun, blowtube |
| blowtorch | (noun) a burner that mixes air and gas to produce a very hot flame | Synonyms: blowlamp, torch |
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| blowtube | (noun) a tube that directs air or gas into a flame to concentrate heat | Synonyms: blow tube, blowpipe |
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| (noun) a tube through which darts can be shot by blowing | Synonyms: blow tube, blowgun, blowpipe |
| blowup | (noun) a photographic print that has been enlarged | Synonyms: enlargement, magnification |
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| (noun) an unrestrained expression of emotion | Synonyms: ebullition, effusion, gush, outburst |
| (noun) a violent release of energy caused by a chemical or nuclear reaction | Synonyms: detonation, explosion |