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to stack up
[phrase form: stack]
01
to neatly arrange objects, usually in a vertical arrangement, forming piles
Transitive: to stack up sth
Examples
The librarian worked diligently to stack up the returned books in their designated places on the shelves.
After finishing the puzzle, she decided to stack the pieces up neatly on the table.
02
(of aircraft) to fly over an airport at different heights, waiting for specific landing instructions
Intransitive
Transitive: to stack up an aircraft
Examples
Due to heavy air traffic, planes had to stack up over the airport, causing delays in landing.
During the storm, planes were forced to stack up in the air, creating a challenging situation for air traffic control.
