An Undie Run is an event where a large number of people disrobe until they are only wearing underwear, and then run. The site of Undie Runs are typically college campuses, but they may occur on other sites such as streets.
双语例句
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The UCLA UndieRun, which takes place on the Wednesday of the school's mid-terms, is intended to alleviate the pressure that comes with big exams.(See photo)