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Attempting to influence (an official) to take desired actions.

Although it is an Americanism that isn't recorded until 1808, a lobby, a group trying to influence the government to promote its own special interests, seems to derive ultimately from the large entrance hall to the British House of Commons that was called the Lobby as early as the 17th century. In the Lobby, people could talk to members of parliament and many tried to influence MPs there.

—Robert Hendrickson, Encyclopedia of Word and Phrase Origins,
Facts On File, Inc., New York, 1997.
This entry is located in the following unit: lobia, laubia (lobby) (page 1)