A matter or case being settled; something comes to a conclusion or is resolved.
証拠が見つかり、ついに一件落着となった。
Evidence was found and at last the case was closed.
会議で最終案が承認され、一件落着した。
The final proposal was approved at the meeting, and the matter was settled.
問題の原因が判明して、一件落着と思った矢先に新たな事実が出てきた。
Just when we thought the matter was settled after finding the cause, new facts emerged.