keep someone on their toes
idiomPart oftoe
keep someone on their toes — idiom
1. To make sure someone stays alert, ready, and able to deal with anything unexpect
1.idiom
Definition
To make sure someone stays alert, ready, and able to deal with anything unexpected that might happen.
Example
Surprise quizzes kept the students on their toes throughout the semester.
Tariro's boss liked to ask sudden questions to keep the team on their toes.