A supply (especially a large one) of something kept for future use, specifically in case the cost of the item increases or if there a shortage.

To accumulate or build up a supply of (something). / (mining) To heap up piles of (coal or ore) on the ground after it has been mined. / (intransitive) To build up a supply; to accumulate.

plural of stockpile

simple past tense and past participle of stockpile

plural of stockpiler

One who stockpiles.

present participle of stockpile

The process of building up a stockpile.

plural of stockpiling