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
Patxi	-	Basque
Sylvester	[sil'vestə]
Barabal	-	Scottish
Margarida	mar-ga-REE-də (Portuguese)	Portuguese, Galician, Catalan, Occitan
Cahya	CHAH-yah	Indonesian
Brutus	-	Ancient Roman