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
Charlotta	shah-LOT-ah	Swedish
Lianne	lee-AN	English (Rare)
Iseult	i-SOOLT (English), i-ZOOLT (English), EE-səlt (English)	Arthurian Romance
MÁIrtÍN	-	Irish
Parham	['pærəm]
Kaoru	kah-o-ṙoo	Japanese