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English definition of “lobby”

lobby

noun [C] (PRESSURE GROUP)    /ˈlɒb.i/ US  /ˈlɑː.bi/
a group of people who try to persuade the government or an official group to do something: the anti-smoking lobbyGroups of peopleActivism and pressure groups
(Definition of lobby noun (PRESSURE GROUP) from the Cambridge Advanced Learner's Dictionary & Thesaurus © Cambridge University Press)
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