up on

up on someone or something

Fig. knowledgeable about someone or something. Ask Tom about the author of this book. He's up on stuff like that.

Name	Pronounced	Usage
CornÉLie	-	French
Jaumet	-	Catalan
Yusuf	-	Arabic, Turkish
Trudy	TROO-dee (English), TRUY-dee (Dutch)	English, Dutch
Hyrum	HIE-rəm	English (Rare)
Wilburg	-	Anglo-Saxon