Sentence:  They could simply have replied, "No, we're way too square. And until you do come up with an answer, stick to the syllabus so that we don't have to <WSD>flunk out</WSD> your mixed-up students when we get them next quarter." 
Meaning of the word marked with <WSD> tags:  (of an educator or institution) To impose failing grades on (a student), often requiring a retaking of the course or academic year.