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
Cainneach	-	Irish
Alkyone	-	Greek Mythology
Einarr	-	Ancient Scandinavian
Iago	ee-A-gaw (Welsh, Galician), ee-AH-go (English)	Welsh, Galician, Portuguese
Esther	ES-tər (English, Dutch), es-TER (French)	English, French, Spanish, Dutch, German, Danish, Norwegian, Swedish, Jewish, Biblical, Biblical Lati
York	YORK	English