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
Geretrudis	-	Ancient Germanic (Latinized)
Remao	rə-MAW	Limburgish
Dunyasha	-	Russian
Lyndsey	LINDZ-ee	English (Modern)
SzilÁRd	-	Hungarian
Yuuma	yoo:-mah	Japanese