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
Phile	-	Ancient Greek
Bandi	-	Hungarian
Bonaccorso	-	Italian
Zdislav	-	Czech, Medieval Slavic
Joni (2)	YO-nee	Finnish
Makariy	-	Russian (Archaic)