1. a violent collision or crash, especially involving vehicles
Usage: informal
2. a complete failure or breakdown of something
Usage: informal

Examples

• The smashup on the highway caused a three-hour traffic delay.
• Two cars were involved in the smashup at the intersection.
• The financial smashup left the company bankrupt.
• After the smashup, both drivers were taken to the hospital.
• The merger talks ended in a complete smashup.
• Emergency crews rushed to the scene of the smashup.
• The political campaign suffered a smashup after the scandal broke.