Definition
to make someone understand something, especially when they have been told many times before and the speaker is annoyed
（尤指多次告知后仍不理解时，恼怒地说）使某人理解某事
I don't know how to get it into your thick head that you can't use your phone during meetings!
我不知道该怎么让你明白，会议期间不能使用手机！
You need to get it into your thick head that I'm not changing my mind; just give up already!
你需要明白我是不会改变主意的，还是放弃吧！
I’ve been trying to get it into his thick head that the report needs to be submitted on time, but he doesn’t seem to listen.
我一直试着让他明白报告需要按时提交，但他似乎听不进去。