From facing lines: Ends circulate around the outside passing three people right shoulders to do a quarter in immediately upon passing the third person. These two become a pair facing in on the outside of an eight chain thru formation. Simultaneously, the center four pass thru, quarter out, partner trade and then pass thru. Finishes in a static square with two couples facing out and two facing in. Load the Boat, along with Horseshoe Turn, started a whole trend of combination movements that still continues unabated.
Holman Hudspeth 1966
This definition is from The Handbook of Modern Square Dancing by Jay King.
It is provided here for informational and educational purposes only.