1For a structure or landform to lose its form and fall apart — to collapse or crumble.
地震で古い塀が崩れた。
The old wall collapsed in the earthquake.
大雨で山の斜面が崩れる危険がある。
There is a risk that the mountainside will collapse due to heavy rain.
積み上げた本が崩れて床に散らばった。
The stacked books collapsed and scattered across the floor.
崖が崩れて道路がふさがれた。
The cliff collapsed and blocked the road.
2For clothing, food, one's posture, etc. to lose its proper shape and become untidy or deformed.
湿気で髪型が崩れてしまった。
My hairstyle got messed up because of the humidity.
洗濯したらセーターの形が崩れた。
The sweater lost its shape after being washed.
持ち運んでいる間にケーキが崩れてしまった。
The cake fell apart while being carried.
3For something to fall apart and descend into disorder — used of plans, systems, or coordination breaking down.
交渉が決裂して計画が崩れた。
The negotiations broke down and the plan fell apart.
チームの連携が崩れて試合に負けた。
The team's coordination fell apart and they lost the match.
システムに不具合が出て業務が崩れた。
A system malfunction threw the operations into disarray.
4For a stock market or exchange rate to crash or slump sharply.
市場が暴落して株価が崩れた。
The market plunged and stock prices crashed.
円相場が崩れて輸入コストが上がった。
The yen exchange rate slumped and import costs rose.
5For a large-denomination bill to be broken into smaller change.
一万円札が崩れて千円札になった。
The 10,000-yen bill was broken into 1,000-yen bills.
6For the weather or one's physical condition to change for the worse — as in "the weather will turn bad."
明日は天気が崩れる予報だ。
The forecast says the weather will turn bad tomorrow.
台風で一気に天候が崩れた。
The typhoon caused the weather to deteriorate all at once.
体調が崩れて会社を休んだ。
My condition deteriorated, so I took the day off work.