1 [countable] British English a serious road or railway accident - used especially in newspapers [= crash]:
Young boy hurt in car smash.
Young boy hurt in car smash.2 [countable] also smash hit a new film, song etc which is very successful :
a box-office smash (=a film which many people go to see at the cinema)
a box-office smash (=a film which many people go to see at the cinema)3 [countable]DST a hard downward shot in tennis or similar games

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