Longman Dictionary of Contemporary English homepage

stack

2 verb
     
stack2
1 also stack up [intransitive and transitive] to make things into a neat pile, or to form a neat pile:
The assistants price the items and stack them on the shelves.
a stacking hi-fi system
2 [transitive usually passive] to put neat piles of things on something:
He went back to stacking the shelves.
be stacked with something
The floor was stacked with boxes.
3

the odds/cards are stacked against somebody

used to say that someone is unlikely to be successful
4

stack the cards

British English stack the deck American English informalDGC to arrange cards dishonestly in a game

stack up

phrasal verb
1

stack something ↔ up

to make things into a neat pile
2 informal used to talk about how good something is compared with something else
stack up against
Parents want to know how their kids' schools stack up against others.
3 if a number of things stack up, they gradually collect or get stuck in one place:
Traffic stacked up behind the bus.
Definition from the Longman Dictionary of Contemporary English
Advanced Learner's Dictionary.

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