noun

• (UK, Ireland, colloquial) A traffic collision.
  "The driver and two passengers were badly injured in the smash."
• (colloquial) Something very successful or popular (as music, food, fashion, etc).
  "This new show is sure to be a smash."
• (tennis) A very hard overhead shot hit sharply downward.
  "A smash may not be as pretty as a good half volley, but it can still win points."
• (colloquial, archaic) A bankruptcy.
  "Supposing a man has for the space of a month carried on trade in a showy shop in Cheapside, and then comes a smash, — is he not to be held a trader within the bankrupt law, because no one can swear that he has traded for four months?"

verb

• (transitive) To break (something brittle) violently.
  "The demolition team smashed the buildings to rubble."
• (intransitive) To be destroyed by being smashed.
  "The crockery smashed as it hit the floor."
• (transitive) To hit extremely hard.
  "He smashed his head against the table."
• (transitive, figuratively) To ruin completely and suddenly.
  "The news smashed any hopes of a reunion."