Pest meaning

pĕst
The definition of a pest is an annoying person or thing.

An example of a pest is a bug that keeps buzzing in someone's ear.

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An annoying person or thing; a nuisance.
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An organism, typically an insect, that sickens or annoys humans, hampers human activities, damages crops or food products, harms livestock, or causes damage to buildings.
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A deadly epidemic disease; a pestilence.
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A former town of north-central Hungary on the left bank of the Danube River. Since 1873 it has been part of Budapest.
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A person or thing that causes trouble, annoyance, discomfort, etc.; nuisance; specif., any destructive or troublesome insect, small animal, weed, etc.
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A fatal epidemic disease; esp., bubonic plague.
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An organism, typically an insect, that sickens or annoys humans, hampers human activities, damages crops or food products, harms livestock, or causes damage to buildings.
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A deadly epidemic disease; a pestilence.
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(originally) A plague, pestilence, epidemic.
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An annoying, harmful, often destructive creature.
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An annoying person.
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(UK, slang) Someone with poor social discipline who continually bothers uninterested women.

Stop being such a pest and leave that girl alone!

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Origin of pest

French peste pestilence from Old French from Latin pestis