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

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Word of the day vituperate
Pronunciation: vɪˈtjuːpəreɪt
verb
blame or insult (someone) in strong language...