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pileup | multiple collisions of vehicles | ||
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V1, V2 |
pile up, heap up, stack up | arrange into piles or stacks | ||
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V1 |
accumulate, pile up, gather, amass, cumulate, conglomerate | collect or gather | ||
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V2 |
collect, accumulate, compile, roll up, pile up, amass, hoard | get or gather together |