1To tear down or demolish something such as a building or landform, causing it to collapse.
古いビルを崩して、跡地に公園を作る計画がある。
There's a plan to demolish the old building and turn the site into a park.
工事のために、山の斜面の一部を崩した。
Part of the mountain slope was cut away for construction.
子どもが積み木で作ったタワーを崩してしまった。
The child knocked down the tower he'd built out of blocks.
2To disturb order or balance; commonly used for health too, as in 体調を崩す (to fall out of good health).
無理をして体調を崩してしまった。
I pushed myself too hard and ended up ruining my health.
急な予定変更でスケジュールを崩されて困った。
The sudden change of plans threw off my schedule, which was a problem.
彼の一言がその場の雰囲気を崩してしまった。
His remark ruined the mood of the room.
強い向かい風がランナーのフォームを崩した。
A strong headwind threw off the runner's form.
3To loosen up a formal posture or expression, becoming more relaxed.
「どうぞ楽になさってください」と言われ、彼は姿勢を崩した。
Told "please make yourself comfortable," he relaxed his posture.
写真撮影が終わると、みんな一斉にポーズを崩した。
As soon as the photo shoot ended, everyone relaxed their poses at once.
4To exchange a large-denomination bill for smaller bills or coins.
コンビニで一万円札を崩してもらった。
I had a convenience store break my 10,000-yen bill.
自動販売機は千円札を崩せないものが多い。
Many vending machines can't break 1,000-yen bills.
5To write kanji in a cursive, running style rather than the formal block style.
書道の授業で、字を崩して書く行書を習った。
In calligraphy class, we learned to write in the running script style, with more flowing characters.
彼のメモは字を崩しすぎて、他人には読めない。
His notes are written in such a cursive style that others can't read them.
6For a tense or straight face to relax and break into a smile.
厳しい審査員の顔も、演技の見事さに思わず崩した。
Even the strict judge's stern face broke into a smile at the wonderful performance.
孫の顔を見た瞬間、祖母は表情を崩した。
The moment she saw her grandchild's face, the grandmother's expression softened into a smile.
7To lower the price of goods.
在庫を早く売るため、店は価格を崩した。
To sell off the stock quickly, the store lowered its prices.
交渉の末、業者は見積もりを少し崩してくれた。
After negotiating, the contractor lowered the quote a little.