What does "through" mean here?
The word "through" in this case is attached to the phrase "come through" which means that something will be expressed, communicated, or will happen. In this case, "come smiling through" is used to refer to a rainbow, which will eventually appear in a semi-circle or in the shape of a smile, as if it is smiling. Here's some examples of "come through": Ex: Keep holding on, you will eventually come through this hard time. Ex: The colors in the painting come through beautifully.
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