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 bimble
Pronunciation: ˈbɪmb(ə)l
verb
walk or travel at a leisurely pace