1. noun /stæk/
a) A large pile of hay, grain, straw, or the like, larger at the bottom than the top, sometimes covered with thatch.
Please bring me a chair from that stack in the corner.
b) A pile of similar objects, each directly on top of the last.
2. verb /stæk/
a) To arrange in a stack, or to add to an existing stack.
Please stack those chairs in the corner.
b) To arrange the cards in a deck in a particular manner.
This is the third hand in a row youve drawn a four-of-a-kind. Someone is stacking the deck!
Wikipedia foundation.