asleep at the wheel
在关键时刻疏忽大意或无所作为
口语·比喻·表示疏忽失职
英文释义
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.
典故来源
字面指开车时睡着，引申为在重要职责或关键时刻疏忽大意、不警觉。