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English definition of “be stacked up”

be stacked up

phrasal verb with stack     /stæk/ verb [T]
If aircraft are stacked up over an airport , they circle over the airport at different heights , waiting to be told they can land .AviationTravelling by aircraftMovement through the airTraffic jams
(Definition of be stacked up from the Cambridge Advanced Learner's Dictionary & Thesaurus © Cambridge University Press)
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