noun
destruction; demolition; smashing apart
Physical act of breaking something into pieces, often violently or forcefully. Can be used for objects, buildings, etc.
古い家のぶち壊しが始まった。
The demolition of the old house has begun.
彼は怒って机をぶち壊
He got angry and smashed the desk to pieces.
noun
spoiling; ruining
Abstract sense: ruining a plan, mood, relationship, or situation. Often used with 気分, 計画, 話, etc.
雨でピクニックがぶち壊しになった。
The rain ruined the picnic.
彼の一言で楽しい雰囲気がぶち壊しだ。
His one remark spoiled the pleasant atmosphere.