be on one's toes all the time ; always be on the alert
keep one's tools bright 常备不懈 The gardener' s tools are kept in the shed. 花匠的工具放在小屋里。
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They were constantly on the alert not to be taken by surprise.
他们一直处于常备不懈状态以防突然袭击。
突击巡察有助于使员工常备不懈。
Surprise visits help to keep the staff on their toes.
《牛津词典》
《新英汉大辞典》
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