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(entomology) An insect of the order Hemiptera (the “true bugs”).
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(informal, proscribed) Any motile small terrestrial invertebrate, especially one that is seen as a pest.
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(informal) Any minibeast.
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(chiefly computing, engineering jargon) A problem that needs fixing.
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A contagious illness, or a pathogen causing it.
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(informal) An enthusiasm for something; an obsession.
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(informal) A keen enthusiast or hobbyist.
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A concealed electronic eavesdropping or intercept device
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A small and usually invisible file (traditionally a single-pixel image) on a World Wide Web page, primarily used to track users.
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(television) A small, usually transparent or translucent image placed in a corner of a television program to identify the broadcasting network or cable channel.
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(aviation) A manually positioned marker in flight instruments.
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A semi-automated telegraph key.
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(obsolete) Hobgoblin, scarecrow; anything that terrifies.
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(chiefly LGBTQ, often preceded by the) HIV.
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(poker) A limited form of wild card in some variants of poker.
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(US, oil industry, slang, dated) Synonym of oil bug.
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(slang, US, horse-racing) An asterisk denoting an apprentice jockey's weight allowance.
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(slang, US, horse-racing, by extension) A young apprentice jockey.
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(printing) Synonym of union bug.
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(gambling, slang) A small piece of metal used in a slot machine to block certain winning combinations.
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(gambling, slang) A metal clip attached to the underside of a table, etc. to hold hidden cards, as a form of cheating.