get through one's head
get through one's head {v. phr.}
1. To understand or believe.
Jack couldn't get it through his head that his father wouldn't let him go to camp if his grades didn't improve.
At last Mary got it through her head that she had failed to pass the test.
2. To make someone understand or believe.
I'll get it through his head if it takes all night.
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Source: A Dictionary of American Idioms