lobby

noun (plural lobbies)

• 1a room providing a space out of which one or more other rooms or corridors lead, typically one near the entrance of a public building.

• 2a group of people seeking to influence politicians or public officials on a particular issue:members of the anti-abortion lobby [as modifier]:lobby groups
• [in singular] an organized attempt by members of the public to influence politicians or public officials:a recent lobby of Congress by retirees

verb (lobbies, lobbying, lobbied)

• seek to influence (a politician or public official) on an issue:it is recommending that booksellers lobby their representatives [no object]:a group lobbying for better rail services