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
Desiree	[deizi:'rei]
Brandie	BRAN-dee	English
U-Jin	oo-jeen	Korean
Joandra	jo-AN-drə	English (Rare)
Salome	[sə'ləumi]
Jakob	YAH-kawp (German), YAH-kob (Danish)	German, Swedish, Norwegian, Danish, Icelandic, Dutch, Slovene