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English definition of “lobby”

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lobby

verb [I or T] uk   /ˈlɒb.i/ us    /ˈlɑː.bi/
C2 to try to persuade a politician, the government, or an official group that a particular thing should or should not happen, or that a law should be changed: Small businesses have lobbied hard for/against changes in the tax laws. [+ to infinitive] Local residents lobbied to have the factory shut down. [+ obj + to infinitive ] They have been lobbying Congress to change the legislation concerning guns.
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lobby

noun [C] uk   /ˈlɒb.i/ us    /ˈlɑː.bi/

lobby noun [C] (PRESSURE GROUP)

a group of people who try to persuade the government or an official group to do something: the anti-smoking lobby

lobby noun [C] (ROOM)

B2 the (large) room into which the main entrance door opens in a hotel or other large building in the UK parliament, a room where someone meets a member of parliament who they have arranged to talk to, or one of the two passages that members of parliament walk through as a way of voting
(Definition of lobby from the Cambridge Advanced Learners Dictionary & Thesaurus © Cambridge University Press)
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