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Imagine that your head is a light bulb. If it is screwed on right, the bulb lights up. This idiom can mean either that you are a smart person or that you are a dumb one, depending on how you use it.

Examples:

He really has his head screwed on right. This means he is smart.

He doesn't have his head screwed on right. This means he is dumb.

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13y ago

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