A pile of crashed vehicles due to a traffic accident. / (American football) A pile of tackling players. / An accumulation that occurs over time, especially one which is not welcome.

A machine for forcing a pile, a long beam, into the ground as part of the construction of a foundation; usually by raising a weight and then dropping it on the beam.

(chemistry) An early electrical battery using multiple cells of zinc and graphite in dilute chromic acid

(obsolete) The finest and most costly kind of velvet, with a fine, thick pile.

(UK, obsolete) The game of wagering money on heads or tails.

(US colloquial, transitive) To cause a group of people to lie in a pile upon another, originally as a punishment to the victim on the bottom.

(US, colloquial) A disorderly pile of people formed by jumping upon a victim.

(astronomy) An astronomical object that is not a monolith, but rather consists of numerous pieces of rock that have coalesced under the influence of gravity.

plural of pile on

simple past tense and past participle of pile up