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English definition of “gun”

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gun

noun [C] uk   /ɡʌn/ us  
B1 a weapon that bullets or shells (= explosive containers) are fired from: The British police do not carry guns. You could hear the noise of guns firing in the distance. in sport, a device that makes a very loud sudden noise as a signal to start a race: At the gun, the runners sprinted away down the track. a device that you hold in your hand and use for sending out a liquid or object: a spray gun
See also
hired gun mainly US informal a person who is paid to shoot and kill someone
More examples

gun

verb [T] uk   /ɡʌn/ (-nn-) mainly US old-fashioned informal us  
to make an engine operate at a higher speed: You must have been really gunning the engine to get here on time.
Phrasal verbs
(Definition of gun from the Cambridge Advanced Learners Dictionary & Thesaurus © Cambridge University Press)
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