get something into your/somebody's head
get (something) into (one's) head
To believe that something is true. Get it into your head: I'm in charge until Mom gets home, so you have to listen to me. A: "Why is Johnny holding his breath?" B: "Well, he's gotten it into his head that holding his breath will make him taller."
Farlex Dictionary of Idioms. © 2015 Farlex, Inc, all rights reserved.
get something into your/somebody’s (thick) ˈhead(informal) succeed in understanding or in making somebody understand something fully: When are you going to get it into your thick head that you don’t need to worry about money? You’re rich now. ♢ I’m still trying to get it into my head that I’m free to do what I want now.
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