Sporting One's Oak

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I came across this expression today while reading one of the stories in James Buncie's Sydney Chambers and the Perils of the Night. The story was "Unholy Night." My interest in etymology and the origin of words and phrases led me to want to learn what this expression means. Though at first glance, it seems somewhat salacious, the context belied such a meaning. The website worldwidewords.com provided an explanation that perfectly suited the context of the story. "To sport one’s oak is a rather dated expression, mainly from the universities of Oxford and Cambridge. College rooms of the older sort usually had two doors, an inner one for ordinary use and an outer, more massive wooden door, called the oak, which was normally folded back against the outside wall. (It was called the oak for the boring but reasonable reason that oak was the wood most commonly used to make it.) By convention, if you closed the outer door you indicated that you wanted to be left undisturbed, say because you were giving a tutorial. Sport here is an old use of the verb, meaning that one was exhibiting or showing something. - https://worldwidewords.org/qa/qa-spo2.htm, © Michael Quinion, 1996–. All rights reserved. Now that I know what the expression means, I can continue reading the story. Have you ever been reading and run into a word or expression you just had to look up before you could go on?