Definition of "pileup" [pileup]

• Informal A serious collision usually involving several motor vehicles. (noun)
• An accumulation: "the pile-up of unsold autos” ( New York Times). (noun)

American Heritage(R) Dictionary of the English Language, Fifth Edition. Copyright (c) 2011 by Houghton Mifflin Harcourt Publishing Company. Published by Houghton Mifflin Harcourt Publishing Company. All rights reserved.

• "The pileup is a consequence of other states 'frustration with the influence of the geographically balanced foursome -- Iowa and New Hampshire, and, more recently, South Carolina and Nevada -- whose early-voting status is blessed by party rules."
• "The pileup, which is under investigation, left nearly 100 people stranded in damaged and trapped cars, police said."
• "Do they also pileup, meaning, well, not only did my house burn down, but also x, y and z."