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Definition of Smash up
1. Verb. Damage or destroy as if by violence. "The teenager banged up the car of his mother"
Definition of Smash up
1. Verb. (idiomatic ambitransitive) to destroy, or be destroyed by smashing. ¹
2. Verb. (idiomatic transitive) to injure or maim ¹
¹ Source: wiktionary.com