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
Taonga	-	Southern African, Tumbuka
Solveiga	-	Latvian, Lithuanian
BÚI	-	Ancient Scandinavian
Sunan	-	Thai
Nazarius	-	Late Roman
Gulistan	-	Kurdish