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English definition of “be stacked up”

be stacked up

verb [T] uk phrasal verb with stack   /stæk/ us  
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 Learners Dictionary & Thesaurus © Cambridge University Press)
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