re: three sheets to the wind. This refers to the lines used to control the sails, not the sails themselves.
Loose cannon: when a cannon on board a ship broke loose from its mooring, pandemonium ensued.
Three square meals: Royal navy food on board ship was served on tables with fiddles forming squares to keep dishes from sliding. For many people in that era, finding enough food was a struggle. If you joined the navy, you were guaranteed 'three squares a day'.
The head: The place to do one's business was literally located at the bowsprit.




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