noun
A fog machine is a device that emits a dense vapor to create a fog-like effect in various settings such as theatrical productions, concerts, or Halloween events.
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The theater production used a high-quality fog machine to create a mysterious atmosphere on stage.
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We should bring out the fog machine for the Halloween party to make it more spooky.
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Let's crank up the fog machine and make this place look extra cool.
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Her mind was like a fog machine, producing hazy thoughts that were hard to grasp.