Topsail (noun)

A sail located at the top of a ship's mast.

Origin:

The word "topsail" is derived from the word "top" which means the highest part of something and "sail" which means a large piece of cloth used to catch the wind and move a ship or boat, so it refers to a sail located at the top of a ship"s mast.

Examples:

1. The ship set its topsail and set off to sea.
2. The topsail was the highest sail on the ship.
3. The sailor hoisted the topsail in order to catch more wind.
4. The topsail helped the ship to move faster.
5. The topsail was the first sail to be set when the ship set sail.