noun
a garment shaped like a jacket with long sleeves that is used to bind the arms tightly against the body as a means of restraining a violent person
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The patient was restrained in a straitjacket to prevent any self-harming behavior.
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They had to put him in a straitjacket because he was getting too rowdy.
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They really need to loosen up that straitjacket, it's way too tight.
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Being stuck in a job you hate can feel like wearing a mental straitjacket.