The collapse or disintegration of an organization, system, plan, etc.; to fall apart, often due to internal breakdown or external pressure.
政府の不祥事で与党は支持を失い、ついに党が瓦解した。
Due to a government scandal, the ruling party lost support and eventually disintegrated.
プロジェクトは資金難と内部対立で瓦解寸前だ。
The project is on the verge of collapse because of financial difficulties and internal conflict.
同盟関係が瓦解すると、地域の安全保障に影響が出る。
If allied relations collapse, it will affect regional security.