seek to influence (a legislator) on an issue

they insist on their right to lobby Congress

the organization was formed to lobby for student concerns

a room providing a space out of which one or more other rooms or corridors lead, typically one near the entrance of a public building

they went into the hotel lobby

(in the UK) any of several large halls in the Houses of Parliament in which MPs may meet members of the public

a group of people seeking to influence legislators on a particular issue

contact an anti-traffic lobby for advice and information