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使发怒;使回忆起来;使侃侃而谈；If something sets a person off, it makes them angry, or makes them remember something and they start talking a lot.
The smallest thing sets him off, and he can’t stop talking about his childhood.
一件微不足道的小事都能打开他的话匣子，他会滔滔不绝地讲述他的童年。 -
to make sth more noticeable or attractive by being placed near it 衬托；使显得更突出（或更漂亮）
That blouse sets off the blue of her eyes.
那件上衣衬托出了她的蓝眼睛。 -
to begin a journey
We set off for London just after ten.