这个短语的字面解释是“野外的一天”，这是什么意思呢？请看对话：

    A: How was your day?

    B: The boss was gone and we had a field day today. No one got anything done.

    Note: This term refers to “freedom from one’s usual work schedule” and “a very enjoyable time.” The original use of this term comes from the military. The literal sense of the term, that is, a day spent in field manoeuvers, is now little used. The first reference we have for that meaning is from 1747, and “field day” was a commonly used term in the military throughout the rest of the 18th century. During the 19th century it began to be extended to refer to any event that might happen in a field. Around that time the term also began to be used for any exciting or welcome event. We spend less time in fields now than before and during the 20th century the term was further extended to include opportunity as well as enjoyment. For example: Clergyman found drunk in nightclub — the tabloids will have a field day with that.