Meanings
Some postulate the idiomatic usage is derived from the "parade day" military use. A parade is much easier than the soldiers’ usual drilling and intense exercise.
How to pronounce "field day":
AU
A day for manoeuvres and tactical exercises in "the field".
A school day for athletic events; a sports day.
A day of class taken away from school for a field trip.
A great time or a great deal to do; a period of bustling activity.
Example: "They went to the park and had a field day playing on the swings."
A great time or a great deal to do, at somebody else's expense.
Example: "The reporters will have a field day with a comment like that."
Example: "The scandal was a field day for the press."
Example Sentences
1
The kids had a field day playing soccer in the park.
2
The news reporters had a field day with the political scandal.
3
The critics had a field day reviewing the latest movie.
4
The comedians had a field day making jokes about the celebrity's mishap.
5
The sales team had a field day with the new product launch.