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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
02
(of aircraft) to fly over an airport at different heights, waiting for specific landing instructions
Intransitive
Transitive: to stack up an aircraft
stack up
v
Example
The warehouse manager instructed the team to stack up the boxes according to their size for efficient storage.
The librarian worked diligently to stack up the returned books in their designated places on the shelves.
The construction workers were careful to stack up the bricks securely to build a stable wall.
Due to heavy air traffic, planes had to stack up over the airport, causing delays in landing.
Air traffic controllers had to make quick decisions to safely stack up the planes during the peak travel hours.
