| 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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| lowball | (verb) make a deliberately low estimate | Synonyms: underestimate |
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| lowborn | (adjective) of humble birth or origins | - |
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| lowboy | (noun) a low chest or table with drawers and supported on four legs | - |
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| lowbred | (adjective) (of persons) lacking in refinement or grace | Synonyms: bounderish, ill-bred, rude, underbred, yokelish |
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| lowbrow | (adjective) characteristic of a person who is not cultivated or does not have intellectual tastes | Synonyms: lowbrowed, uncultivated |
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| (noun) a person who is uninterested in intellectual pursuits | Synonyms: anti-intellectual, philistine |
| lowbrowed | (adjective) characteristic of a person who is not cultivated or does not have intellectual tastes | Synonyms: lowbrow, uncultivated |
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| plowboy | (noun) a boy who leads the animals that draw a plow | Synonyms: ploughboy |
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| yellowbird | (noun) American finch whose male has yellow body plumage in summer | Synonyms: goldfinch, New World goldfinch, Spinus tristis |
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| (noun) yellow-throated American wood warbler | Synonyms: Dendroica petechia, golden warbler, yellow warbler |