the act of disturbing the mind or body; "his carelessness could have caused an ecological upset"; "she was unprepared for this sudden overthrow of their normal way of living"心身を乱す行動撹乱
例:She was unprepared for this sudden overthrow of their normal way of living. 彼女はいつもの彼らの生活習慣が突然ひっくり返ることに覚悟できていなかった。
the termination of a ruler or institution (especially by force)(特に力によって)支配者や機関を終わらせること顛覆
rule against; "The Republicans were overruled when the House voted on the bill"不利な裁定を下す逆転
cause the downfall of; of rulers; "The Czar was overthrown"; "subvert the ruling class"急激な転落を引き起こす顛覆