Skrap...yeah a knockdown is 90 degrees plus on your side without actually rolling over.
Rigging for sea basically means getting everything down below secure so that it won't go flying around the cabin in rought seas....particularly heavy stuff! Riggng for a knock down means insuring the boat exterior is "sealed" so that a broach will not flood the boat. This would include hatchboards & companionway secured...dorades removed and plates installed, all
hatches secured etc. . The object is to insure the boat acts like a cork rather than a stone after the knockdown.