sand jack
noun Shipbuilding.
any of a number of containers of sand driven beneath a hull about to be launched as a temporary support and then drained of sand so as to let the hull down onto the launching cradle.
Words nearby sand jack
sand eel,
sand flea,
sand fly,
sand grouse,
sand hopper,
sand jack,
sand lance,
sand leek,
sand lily,
sand lizard,
sand lovegrass