From Longman Dictionary of Contemporary Englishsmash something ↔ in phrasal verbDESTROYto hit something so violently that you break it and make a hole in itThe door had been smashed in.smash somebody’s face/head in (=hit someone hard in the face or head)I’ll smash his head in if he comes here again! →smash→ See Verb table
Examples from the Corpus
smash in• In track, only world record-holder Wang Junxia has had staying power since smashing world records in 1993. 16.• Yet, each time, when the smoke had cleared, the enemy was smashed.• They smashed the door in and rushedinside.• Get tooled up with baseballbats and go smash some windows in some club.• Fred Titmus bowled the right sort of ball and I smashed it in the direction of the pavilion.• If you kill the people you love - or run away from them - you only smash yourself in the end.• He kept his hands in his pockets so he would not smash Tony Angotti in the face.• He seized another woodenleg and smashed the glass in the nearest cases with it.smash somebody’s face/head in• He could just imagine the Woman hitting him, smashing at his face in the dark with the butt of her gun.