It seems my understanding of all those Sailing terms is lacking. On this website page from Yachtracing.com the correct meaning is displayed.
For instance; a Shackle = a device even harder to open under pressure than a virgin's bra! or Inside Overlap = The part of a race that resembles a political debate. And what about Winch: A thing you grind till it squeals and Wench: A thing you grind till it squeals. I'll spare you who's designated the nut attached to the rudder through a steering mechanism.
I wonder what these guys would make of the definitions Overlap or Two-Length Zone?