Definition of "Stack" :

noun: a storage device that handles data so that the next item to be retrieved is the item most recently stored (LIFO)

noun: a large tall chimney through which combustion gases and smoke can be evacuated

noun: a list in which the next item to be removed is the item most recently stored (LIFO)

noun: an orderly pile

noun: (often followed by of') a large number or amount or extent

verb: arrange the order of so as to increase one's winning chances

"Stack the deck of cards."

verb: arrange in stacks

"Stack your books up on the shelves."

verb: load or cover with stacks

"Stack a truck with boxes."