A dim bulb is a person who is not very intelligent. Since bright is another word for intelligent, and dim is the opposite of bright, you can see how this expression emerged. A bulb is a lightbulb.
This is not a very nice thing to say about somebody, so I'm not putting it here for you to say, but for you to recognize!
A variation on this is "She's not the brightest bulb on the string." The meaning is the same, and the image is of a string of lights with one dim bulb.
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