Go off the rails
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解説を表示
Go off the rails means to lose control, become disorganized, or begin behaving in an unacceptable or disruptive manner. The phrase compares an orderly process or person to a train that has left its tracks. When a train leaves its rails, direction and safety disappear. In everyday English, the expression applies both to people whose conduct turns destructive and to plans, events, or conversations that collapse into chaos.
The community festival went off the rails after the power failed and heavy rain began.