A small rope extending vertically from the topping lift to the boom for holding a fore-and-aft sail when it is being taken down.
 Example sentencesExamples
-  The fully battened main has lazy jacks which make raising and lowering the sail a simple task.
 -  The lazy jacks contain the bunt of the sail, so there's no need to tie off the individual reef pendants.
 -  Additionally, the lazy jacks prevent the boom and sails from falling all over everyone in the cockpit.
 -  With lazy jacks it might make sense to run the main halyard and topping lift aft to the cockpit.
 -  You simply lower the halyard, let the sail settle between the lazy jacks into the cover, and zip the cover closed.