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
Ursula	UR-sə-lə (English), UR-syə-lə (English), OOR-soo-lah (Finnish)	English, Swedish, Norwegian, Danish, German, Dutch, Finnish, Late Roman
Guglielmo	gool-LYEL-mo	Italian
Athy	['æθi]
Csenge	CHENG-ge	Hungarian
Garaile	-	Basque
Norbaer	nawr-BER	Limburgish