Used when something is abruptly ended or halted, often with force or by authority. The new policy will snuff out any hope for an extended vacation.
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Metaphorical Use
Often used figuratively to describe the end of abstract concepts like ideas or movements. The invention of cars slowly snuffed out the horse-drawn carriage industry.
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With Authority
Can imply that the person or group ending something has the power or control over it. The director snuffed out the rumors about the company's bankruptcy.