noun
a large number of things that are heaped or stacked on top of each other
verb
no applicable
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The highway was closed due to a massive pileup involving multiple vehicles.
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There was a huge pileup on the freeway this morning, causing major delays.
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Dang, did you see that crazy pileup on the road? It was insane!
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The project hit a pileup when several key team members left unexpectedly.