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1. (noun) (military) A parade day. In the Navy and Marine Corps, 'field day' refers to a thorough cleaning of the ship's spaces or on-shore living and work areas.
2. (noun) A school day for athletic events; a sports day.
3. (noun) A day of class taken away from school for a field trip.
4. (noun) (idiom) A great time or a great deal to do.
5. (noun) (idiom) A great time or a great deal to do, at somebody else's expense.
6. (noun) (context/US Navy) Top-to-bottom all-hands cleaning.