There are many terms and expressions in current use which had their origins long ago in the days of sailing ships. For instance, a sailor who “knows the ropes” was experienced in handling the sheets or sails. When you are, “three sheets to the wind”, you have probably lost control. Sailors used to sneak their liquor on board in the top of their boots, hence the term, “boot legging.” “Above board” meant the cargo was observable on the deck, not hidden. “Footloose” is when the bottom of the sail is not secured and dances in the wind.