Field day

Meaning

A period of great enjoyment or activity.

Usage

Used when people revel in freedom or fun.

Origin & History

Origins and dates here are approximate summaries. Many idioms have disputed or unknown origins, and not every date has been checked against a historical dictionary, so treat specific dates and stories as a starting point rather than a citation.

Military training days on open fields.

Used in schools and military contexts since the 19th century.