n. a cylinder locking member mounted longitudinally in a plug, which engages multiple tumblers
One or more columns along one or both sides of most blogs main page, usually used for blogroll links, contact information etc.
A lock part located at the 'side' of the plug and fitting into longitudinal grooves in both the plug and the lock body. This keeps the plug from turning until the sidebar is retracted into the plug. Retraction is blocked until the correct key (or picking) moves the pins or other tumblers to positions which cease to block the retraction or produce some other action allowing the retraction. A sidebar can add additional positioning beyond the usual "shear line" and so can make picking more difficult. A number of locks use a sidebar to increase security.