Definition of lazy jack in English:

lazy jack

noun

Sailing
  • 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.

    • ‘The fully battened main has lazy jacks which make raising and lowering the sail a simple task.’
    • ‘With lazy jacks it might make sense to run the main halyard and topping lift aft to the cockpit.’
    • ‘Additionally, the lazy jacks prevent the boom and sails from falling all over everyone in the cockpit.’
    • ‘The lazy jacks contain the bunt of the sail, so there's no need to tie off the individual reef pendants.’
    • ‘You simply lower the halyard, let the sail settle between the lazy jacks into the cover, and zip the cover closed.’