an anteroom of a legislative chamber, esp one either of two anterooms to which members of either of the Houses of Parliament go to vote during a division

(treated as sing. or pl) a group of people engaged in lobbying as representatives of a particular interest group

to try to influence members of a legislative body in favour of or against a policy or course of action

to try to influence (a legislatore.g. a member of a legislative body) with respect to a particular issue

to secure the passage of (legislation) by influencing public officials