The term MAST ITEM is a crossword solution that consists of four letters, SAIL. A SAIL is a piece of fabric attached to a boat or ship that is used to catch the wind and propel the vessel forward. It is typically made from a lightweight material such as canvas or nylon and is attached to a mast, which is a vertical pole that supports the SAIL. The mast item is an essential part of sailing and is necessary for the boat to move.