asleep at the wheel
在關鍵時刻疏忽大意或無所作為
口語·比喻·表示疏忽失職
英文釋義
not paying attention or being unaware of what is happening; being negligent or careless
例句
The security guard was asleep at the wheel when the thief entered the building.
典故來源
字面指開車時睡著，引申為在重要職責或關鍵時刻疏忽大意、不警覺。