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
Arianne	a-ree-AHN	French
Aias	ie-ahs (Ancient Greek)	Greek Mythology
Oluwayemisi	-	Western African, Yoruba
Nelda	NEL-də	English
Bamber	['bæmbə]
Edurne	-	Basque