[fall asleep
at the switch] {v. phr.} To fail to perform anexpected task; be remiss in one's
duty.
The two airplanes wouldn'thave collided, if the control tower operator
hadn't fallen asleep atthe switch.
The dean promised our department $250,000
but thefoundation never sent the money because someone in the dean's officefell
asleep at the switch.
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