Definition of sport the or one's oak in English:

sport the (or one's) oak

British (In certain universities) shut the outer door of one’s room as a sign that one does not wish to be disturbed.
[such outer doors were formerly of oak]
See parent entry: oak

Get more from Oxford Dictionaries

Subscribe to remove adverts and access premium resources

Word of the day dinkum
Pronunciation: ˈdɪŋkəm
adjective
(of an article or person) genuine, honest, true