打ち壊す

also ぶち壊す

1. godan verb, transitive to destroy; to break (by striking); to smash; to knock down
2. to ruin (a plan, atmosphere, etc.); to spoil; to wreck

うちこわす

1. godan verb, transitive to destroy; to break (by striking); to smash (to pieces); to knock down
2. to ruin (e.g. a plan); to wreck; to do away with (an old custom, ideology, etc.); to overthrow (a system); to dismantle