pile-up ( synonym found)
Definition of pile-up:

°(colloquial) A traffic accident or collision involving multiple vehicles.
"Traffic was backed up for miles due to a twelve-car pile-up on the freeway earlier today."
Definition of pile-up:

°(colloquial) A traffic accident or collision involving multiple vehicles.
"Traffic was backed up for miles due to a twelve-car pile-up on the freeway earlier today."
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