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pileup

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pileup/ˈpajəlˌʌp/noun
pluralpileups
pileup
/ˈpajəlˌʌp/
noun
pluralpileups
Learner's definition of PILEUP  
[count]
: an accident in which several or many vehicles crash into each other
: a large amount of something that has increased gradually over a period of time
— see also pile up at 2pile
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