keep someone on their toes
成語所屬單字toe
keep someone on their toes — 慣用語
1. To make sure someone stays alert, ready, and able to deal with anything unexpect
1.慣用語
釋義
使人警覺；使不敢鬆懈
To make sure someone stays alert, ready, and able to deal with anything unexpected that might happen.
例句
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.