Noun | 1. | rag day - a day on which university students hold a rag Britain, Great Britain, U.K., UK, United Kingdom, United Kingdom of Great Britain and Northern Ireland - a monarchy in northwestern Europe occupying most of the British Isles; divided into England and Scotland and Wales and Northern Ireland; `Great Britain' is often used loosely to refer to the United Kingdom day - a day assigned to a particular purpose or observance; "Mother's Day" |