1. violent collisions or crashes, especially between vehicles
Usage: plural of smashup
2. complete failures or disasters
Usage: informal; plural of smashup

Examples

• The highway was closed due to multiple smashups during the storm.
• Three serious smashups occurred at that intersection last month.
• The icy roads caused several smashups on the interstate.
• His business ventures were complete smashups.
• The merger talks ended in smashups between the two companies.
• Emergency crews responded to two smashups within an hour.