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
Stane	-	Slovene
Izudin	-	Bosnian
Mikko	MEEK-kee	Finnish
Gwendoline	GWEN-də-lien (English), GWEN-də-leen (English)	Welsh, English (British), French
Letizia	le-TEE-tsyah	Italian
Deonne	-	English (Rare)