English Lexicon

Bug

/bʌɡ/
nounverbCEFR B2 (Upper)Top #2850 frequency
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Comprehensive Definitions & Senses

2 senses
As noun
  1. 1

    An error, flaw, or malfunction in a computer program or system.

    "The software engineers worked late into the night to fix a critical bug in the payment gateway."
  2. 2

    An insect or small arthropod.

    "He examined the colorful bug crawling slowly across the garden leaf."

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Synonyms (3)
Antonyms & Contrasting Words (1)

Linguistic Origin & Historical Etymology

Originating in the late Middle English period as 'bugge', meaning a scarecrow or hobgoblin, likely related to Middle Welsh 'bwg' (ghost or goblin). By the late 19th century, the term shifted to denote an insect, and famously evolved in 1947 to describe an error in computer hardware or software when engineers literally found a moth trapped in a relay of the Harvard Mark II computer.

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