a massive collision of several or many moving vehicles.
an accumulation, as of work, chores, or bills.
a rough or disorderly falling of people upon one another, as in a football game.

1825–35; noun use of verb phrase pile up

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Based on the Random House Dictionary, © Random House, Inc. 2015.
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Example sentences
The back of the hurricane hasn't gotten the news yet, so there's a pileup.
The quick pileup overloads the underlying snowpack, which causes a weak layer
  beneath the slab to fracture.
But even if you pick your way past that pileup of gerunds, the storytelling
  never takes off.
Pull them apart, and in addition to the human toll, you've got all the makings
  of a nasty corporate pileup.
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