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English definition of “bug”

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bug

noun uk   /bʌɡ/ us  

bug noun (INSECT)

B1 [C] a very small insect
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bug noun (ILLNESS)

B2 [C] informal a bacteria or a virus causing an illness that is usually not serious: I had a tummy/stomach bug last week. There's a bug going around (= an illness that many people are getting).
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bug noun (COMPUTER PROBLEM)

B2 [C] a mistake or problem in a computer program: A bug caused the company's computer system to crash.
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bug noun (DEVICE)

[C] a very small device fixed on to a phone or hidden in a room, that allows you to listen to what people are saying without them knowing

bug noun (ENTHUSIASM)

[S] informal a very strong enthusiasm for something: He's been bitten by the sailing bug.

bug

verb [T] uk   /bʌɡ/ (-gg-) us  

bug verb [T] (ANNOY)

informal to annoy or worry someone: He's been bugging me all morning.

bug verb [T] (HIDE DEVICE)

to place or hide a listening device inside something: often passive She suspected that her phone had been bugged.
(Definition of bug from the Cambridge Advanced Learners Dictionary & Thesaurus © Cambridge University Press)
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