keep (one) on (one's) toes

To force someone to stay active, alert, and focused on something or someone. Having two kids under age five sure keeps me on my toes!

Name	Pronounced	Usage
Krzysiek	-	Polish
Peta	-	English (Australian)
Raniya	-	Arabic
Annett	-	German
Baldo	-	Italian, Spanish, Ancient Germanic
Caris	KAHR-is	English (Rare)