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Chinese dictionary
slseize on an incident to exaggerate matters; make use of the subject under discussion to put over one's own ideas; give vent to one's pent-up feelings on some extraneous pretext; make an issue of
我只是不想给他们借题发挥的机会。
I just don't wanna give them any more ammunition than they already have.
无论李教授讲到什么,他都要借题发挥表达自己的政治观点。
Whatever subject professor Li speaks on, he always makes it a peg to hang his own political views on.