the day after Whit Sunday. It used to be a bank holiday in Britain. In the 1960s it was replaced by the Spring Bank Holiday , which some people still call Whit Monday.
WHIT MONDAY
Meaning of WHIT MONDAY in English
Oxford guide to British and American culture English vocabulary. Руководство по британской и американской культуре, Оксфордский английский словарь. 2005