The fog thinned and came apart
Does "Come apart" mean "dissipate"?
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Yes, "came apart" means "dissipated" here. FumbleFingers correctly mentioned that it does have a bit of a different connotation, but they are synonyms when used to refer to fog (not necessarily when used elsewhere).
This is poetic, but not overly so. It is good writing. Everyone understands what this means, and it helps paint a more vivid mental picture.
We don't normally refer to fog as "coming apart". Google Ngrams has no hits. So either this author is being poetic, or isn't great at writing.
I don't recommend using "come apart" in regular speech to describe what fog does.