Proper noun

1. The second-largest of the Channel Islands.
2. (countable; plural Guernsey) A type of dairy cow bred in Guernsey.
3. (countable; plural Guernseys) A knitted fisherman’s sweater of a type made on the island.
4. (countable; plural Guernseys) A long-sleeved shirt worn by sportsmen, especially in rugby codes (historically).
5. (countable; plural Guernseys) A team-liveried shirt (see jersey)
6. Selection or election to a position (derived from the sense of a team-liveried shirt indicating membership in the team).