get (one's) head around (something)

To understand something that is challenging or confusing. It took a while, but I've finally gotten my head around this chapter in my calculus textbook. Wait, you two are dating now? It's going to take a little while for me to get my head around that!

Common Names:

Name	Pronounced	Usage
Alec
Francisco	frahn-THEES-ko (Spanish), frahn-SEES-ko (Latin American Spanish), frən-SEESH-koo (Portuguese)	Spanish, Portuguese
RisteÁRd	-	Irish
Ili	-	Hungarian
Ghoncheh	-	Persian
Maynard	MAY-nərd	English