english
1
general::
Phrase(s): get something through someone’s thick skull [and] get something into someone’s thick head Fig. to manage to get someone, including oneself, to understand something. • He can’t seem to get it through his thick skull that he has to study to pass the exam. • If I could get this into my thick head once, I’d remember it.
McGrawhill's American Idioms And Phrasal Verbs