SMASHUP Meaning of SMASHUP in English noun 1.Synonyms: collapse 2, breakdown, crack-up, crash, debacle, smash, wreck 2.Synonyms: crash 3, crack-up, pileup, ||prang, smash, ||stramash, wreck Merriam Webster. Collegiate thesaurus English vocabulary. Английский энциклопедический словарь тезаурус. 2003