“have bigger fish to fry”别理解成“要煎更大的鱼”，引申为有更重要的事情要做；有更有趣的事要做。

【例句】
It's really not worth my time. I've got bigger fish to fry!
它真的不值得我花时间，我有更重要的事情要做。

Sorry I can't afford to sit here and chat with you all day. I have bigger fish to fry.
很抱歉我不能坐在这儿和你闲聊啦。我还有更要紧的事要做。