A Sailed Ship is a ship that has left port and is on course through the tough sea known as A Relationship.
Evidence
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A sailed ship is a ship that is considered canon. This is an actual, legit ship that is for real. These people actually dig each other and are actually going out or in an actual canon relationship.
False Sail
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These are ships that are in alternate universes. These are just a taste of what an unlikely ship might be if it was real.